| Preface | xvii |
| 1844 |
| Engels to Marx. Beginning of October | 3 |
| Marx to Julius Campe. 7 October | 7 |
| Marx to Heinrich Börnstein. Not later than November | 8 |
| Marx to Heinrich Börnstein. Autumn | 8 |
| Engels to Marx. 19 November | 9 |
| Marx to Heinrich Börnstein. End of December 1844 - beginning of January 1845 | 14 |
| 1845 |
|
Marx to Arnold Ruge. 15 January | 15 |
|
Engels to Marx. About 20 January | 15 |
|
Marx to Heinrich Heine. End of January-l February | 21 |
|
Engels to Marx. 22 February-7 March | 21 |
|
Engels to Marx. 17 March | 26 |
|
Marx to Heinrich Heine. 24 March | 30 |
|
Marx to Zacharius Lowenthal. 9 May | 31 |
|
Engels to Marie Engels. 31 May | 32 |
|
Engels to Julius Campe. 14 October | 34 |
| 1846 |
|
Engels to Marie Blank. 7 March | 35 |
|
Engels to Emil Blank. 3 April | 36 |
|
Marx to Heinrich Heine. Beginning of April | 37 |
|
Marx to Pierre-Joseph Proudhon. 5 May | 38 |
|
Marx to Karl Ludwig Bernays. 7 May | 40 |
|
Marx to Joseph Weydemeyer. 14-16 May | 41 |
|
Engels to Marx. 27 July | 44 |
|
Engels and Marx to Moses Hesse. 27 July and about 29 July | 47 |
|
Marx to Carl Friedrich Julius Leske. 1 August | 48 |
|
Engels to Marx. 19 August | 52 |
|
Engels to the Communist Correspondence Committee in Brussels. 19 August | 56 |
|
Marx to Karl Ludwig Bernays. August | 60 |
| Engels to the Communist Correspondence Committee in Brussels. 16 September | 60 |
|
Engels to Marx. 18 September | 67 |
|
Engels to Marx. After 18 September | 73 |
|
Engels to Marx. About 18 October | 75 |
| Engels to the Communist Correspondence Committee in Brussels. 23 October | 81 |
|
Engels to Marx. About 23 October | 86 |
|
Engels to Marx. 2 November | 88 |
|
Engels to Marx. Middle of November-December | 89 |
| Marx to Pavel Vasilyevich Annenkov. 28 December | 95 |
| 1847 |
|
Engels to Marx. 15 January | 107 |
|
Marx to Roland Daniels. 7 March | 110 |
|
Engels to Marx. 9 March | 111 |
|
Marx to Engels. 15 May | 117 |
|
Marx to Georg Herwegh. 27 July | 118 |
|
Marx to Georg Herwegh. 8 August | 119 |
|
Marx to Moses Hess. 2 September | 121 |
|
Engels to Marx. 28-30 September | 122 |
|
Marx to Werner von Veltheim. 29 September | 131 |
|
Engels to Lucien-Leopold Jottrand. 30 September | 132 |
|
Engels to Marx. 25-26 October | 133 |
|
Engels to Ceorg Herwegh. 26 October | 140 |
|
Engels to Marx 14-15 November | 142 |
|
Engels to Marx. 23-24 November | 146 |
|
Marx to Pavel Vasilyevich Annenkov. 9 December | 150 |
| 1848 |
|
Engels to Marx. 14 January | 152 |
|
Engels to Marx. 21 January | 155 |
|
Marx to Engels. Between 7 and 12 March | 158 |
|
Engels to Marx. 8-9 March | 158 |
|
Marx to Engels. 16 March | 161 |
|
Engels to Marx. 18 March | 163 |
|
Engels to Emil Blank. 26 March | 165 |
|
Engels to Emil Blank. 28 March | 167 |
|
Marx and Engels to Etienne Cabet. 5 April | 169 |
|
Engels to Emil Blank. 15 April | 170 |
|
Marx to Engels. About 24 April | 171 |
|
Engels to Marx. 25 April | 172 |
|
Engels to Marx. 9 May | 174 |
|
Engels to Emil Blank. 24 May | 175 |
|
Engels to Karl Friedrich Koppen. 1 September | 177 |
|
Marx to Engels. About 29 or 30 October | 177 |
|
Marx to Engels. First half of November | 178 |
|
Marx to Ferdinand Lassalle. 13 November | 180 |
|
Marx to Engels. 29 November | 181 |
|
Marx to Eduard von Muller-Tellering. 5 December | 182 |
|
Engels to Marx. 28 December | 183 |
|
Marx to Wilhelm Stieber. About 29 December | 183 |
| 1849 |
|
Engels to Marx. 7-8 January | 185 |
|
Marx to Eduard von Muller-Tellering. 15 January | 189 |
|
Marx to Ernst Dronke. 3 February | 190 |
|
Engels to Daniel Fenner von Fenneberg. 1 March | 191 |
|
Marx to Colonel Engels. 3 March | 192 |
|
Marx to Colonel Engels. Before 15 April | 194 |
|
Marx to Engels. Before 15 April | 195 |
|
Marx to Engels. 23 April | 195 |
|
Marx to Hermann Brehmer. 6 May | 196 |
|
Marx to Eduard von Muller-Tellering. 6 May | 197 |
|
Marx to Andreas Stifft. 6 May | 197 |
|
Marx to Joseph Weydemeyer. l June | 198 |
|
Marx to Engels. 7 June | 198 |
|
Marx to Joseph Weydemeyer. 13 July | 201 |
|
Marx to Caroline Scholer. 14 July | 202 |
|
Engels to Jenny Marx. 25 July | 202 |
|
Marx to Ferdinand Freiligrath. 31 July | 204 |
|
Marx to Engels. End of July | 207 |
|
Marx to Joseph Weydemeyer. End of July | 208 |
|
Marx to Joseph Weydemeyer. Mid-August | 209 |
|
Marx to Engels. 17 August | 210 |
|
Marx to Engels. 23 August | 212 |
|
Engels to Joseph Weydemeyer. 23 August | 213 |
|
Engels to Jakob Lukas Schabelitz. 24 August | 214 |
|
Marx to Ferdinand Freiligrath. 5 September | 216 |
|
Engels to George Julian Harney. 5 October | 217 |
|
Marx to Louis Bauer. 30 November | 218 |
|
Marx to Joseph Weydemeyer. 19 December | 218 |
|
Engels to Jakob Lukas Schabelitz. 22 December | 221 |
| 1850 |
| Marx to Eduard von Muller-Tellering. 1 January | 223 |
| Marx to Joseph Weydemeyer. 8 January | 224 |
| Marx to Ferdinand Freiligrath. 11 January | 224 |
| Marx to Joseph Weydemeyer. 4 February | 225 |
| Marx to Louis Bauer. 5 February | 226 |
| Engels to Eduard von Muller-Tellering. 7 February | 227 |
| Engels to Julius Schuberth, Theodor Hagen and Stephen Adolph Naut. 4 March | 228 |
| Marx to Eduard von Muller-Tellering. 12 March | 229 |
| Marx to Joseph Weydemeyer. 9 April | 230 |
| Engels to Julius Schuberth. About 11 April | 231 |
| Engels to Joseph Weydemeyer. 22 April | 232 |
| Engels to Joseph Weydemeyer. 25 April | 233 |
| Engels and Marx to Francois Pardigon. 6 May | 235 |
| Engels to Theodor Schuster. 13 May | 236 |
| Engels to Joseph Weydemeyer. 8 June | 237 |
| Marx to Heinrich Burgers. 25 June | 237 |
| Marx to Joseph Weydemeyer. 27 June | 238 |
| Marx to Karl Blind 17 July | 239 |
| Marx to Joseph Weydemeyer. 29 October | 240 |
| Marx to Engels. 19 November | 241 |
| Marx to Engels. 23 November | 242 |
| Engels to Marx. 25 November | 243 |
| Marx to Engels. 2 December | 244 |
| Marx to Hermann Becker. 2 December | 251 |
| Engels to Emil Blank. 3 December | 252 |
| Engels to Marx. 17 December | 254 |
| 1851 |
| Marx to Engels. 6 January | 257 |
| Marx to Engels. 7 January | 258 |
| Engels to Marx. 8 January | 263 |
| Marx to Engels. 22 January | 265 |
| Engels to Marx. 25 January | 266 |
| Marx to Engels. 27 January | 268 |
| Engels to Marx. 29 January | 270 |
| Marx to Hermann Becker. About 1 February | 273 |
| Marx to Engels. 3 February | 273 |
| Engels to Marx. 5 February | 278 |
| Marx to Hermann Becker. 8 February | 282 |
| Marx to Engels. 10 February | 283 |
| Marx to Engels. 11 February | 285 |
| Engels to Marx. 12 February | 286 |
| Engels to Marx. 13 February | 289 |
| Marx to Engels. 23 February | 291 |
| Marx to Engels. 24 February | 297 |
| Engels to Marx. 25 February | 299 |
| Engels to Marx. 26 February | 301 |
| Marx to Engels. 26 February | 303 |
| Engels to Marx. 26 February | 305 |
| Engels to Marx. 27 February | 306 |
| Engels to Marx. 28 February | 307 |
| 2 Marx to Hermann Becker. 28 February | 308 |
| Marx to Engels. 1 March | 311 |
| l54. Marx to Engels. 8 March | 313 |
| Engels to Marx. 10 March | 314 |
| Engels to Marx. 17 March | 315 |
| Marx to Engels. 17 March | 316 |
| Engels to Marx. 19 March | 319 |
| Marx to Engels. 22 March | 321 |
| Marx to Engels. 31 March | 322 |
| Marx to Engels. 2 April | 325 |
| Engels to Marx. 3 April | 326 |
| Marx to Hermann Becker. 9 April | 331 |
| Engels to Marx. 11 April | 332 |
| Marx to Engels. 15 April | 333 |
| Engels to Marx. 15 April | 335 |
| Engels to Marx. 1 May | 336 |
| Engels to Wilhelm Wolff. 1 May | 339 |
| Marx to Engels. 3 May | 342 |
| Marx to Engels. 5 May | 344 |
| Engels to Marx. About 6 May | 346 |
| Engels to Marx. 8 May | 348 |
| Engels to Marx. 9 May | 350 |
| 4 Engels to Marx. 15 May | 353 |
| Marx to Engels. 16 May | 354 |
| Engels to Marx. 19 May | 356 |
| Marx to Engels. 21 May | 359 |
| Engels to Marx. 23 May | 361 |
| Engels to Marx. 27 May | 365 |
| Marx to Engels. 28 May | 366 |
| Marx to Roland Daniels. Second half of May | 368 |
| Marx to Engels. 16 June | 369 |
| Engels to Joseph Weydemeyer. 19 June | 370 |
| Engels to Marx. 27 June | 373 |
| Marx to Joseph Weydemeyer. 27 June | 375 |
| Engels to Marx. About 6 July | 378 |
| Engels to Ernst Dronke. 9 July | 380 |
| Marx to Engels. 13 July | 383 |
| Marx to Engels. About 17 July | 388 |
| Engels to Marx. 17 July | 389 |
| Engels to Marx. About 20 July | 392 |
| Engels to Marx. 30 July | 395 |
| Marx to Engels. 31 July | 396 |
| Engels lo Marx. About 1 August | 399 |
| Marx to Joseph Weydemeyer. 2 August | 401 |
| Engels to Wilhelm Wolff. 6 August | 404 |
| Engels to Joseph Weydemeyer. | 405 |
| Marx to Engels. 8 August | 408 |
| Engels to Marx. About 10 August | 417 |
| Engels to Marx. About 11 August | 419 |
| Marx to Engels. 14 August | 422 |
| Marx to Hermann Ebner. 15-22 August | 426 |
| Marx to Engels. About 20 August | 433 |
| Engels to Marx. 21 August | 434 |
| Marx to Engels. 25 August | 436 |
| Engels to Marx. About 27 August | 444 |
| Marx to Engels. 31 August | 445 |
| Engels to Marx. 1 September | 449 |
| Engels to Marx. 8 September | 451 |
| Engels to Marx. 11 September | 453 |
| Marx to Joseph Weydemeyer. 11 September | 453 |
| Marx to Engels. 13 September | 455 |
| Engels to Marx. 19 September | 457 |
| l4. Engels to Marx. 23 September | 458 |
| Marx to Engels. 23 September | 463 |
| Engels to Marx. 25 September | 468 |
| Engels to Marx. 26 September | 469 |
| Marx to Amalie Daniels. Between 4 and 8 October | 472 |
| Marx to Engels. 13 October | 472 |
| Engels to Marx. 15 October | 477 |
| Marx to Joseph Weydemeyer. 16 October | 480 |
| Marx to Engels. 19 October | 482 |
| Marx to Engels. 25 October | 485 |
| Engels to Marx. About 27 October | 486 |
| Marx to Joseph Weydemeyer. 31 October | 489 |
| Marx to Engels. 24 November | 490 |
| Engels to Marx. 27 November | 493 |
| Marx to Adolf Cluss. Beginning of December | 496 |
| Marx to Engels. 1 December | 496 |
| Marx to Hermann Ebner. 2 December | 499 |
| Engels to Marx. 3 December | 503 |
| Marx to Engels. 9 December | 507 |
| Engels to Marx. 10 December | 508 |
| Engels to Marx. 11 December | 510 |
| Engels to Marie Blank. 15 December | 514 |
| Engels to Marx. 16 December | 515 |
| Engels to Jenny Marx. 18 December | 517 |
| Marx to Joseph Weydemeyer. 19 December | 518 |
| Marx to Ferdinand Freiligrath. 27 December | 520 |
Appendices |
| Jenny Marx to Karl Marx. 11 February 1845 | 525 |
| Jenny Marx to Karl Marx. After 24 August 1845 | 526 |
| Jenny Marx to Karl Marx. 24 March 1846 | 529 |
| George Julian Harney to Frederick Engels. 30 March 1846 | 533 |
| Jenny Marx to Joseph Weydemeyer. 17 March 1848 | 539 |
| Elizabeth Engels to Frederick Engels. After 4 October 1848 | 540 |
| Hermann Ewerbeck to Moses Hess. 14 November 1848 | 542 |
| Elizabeth Engels to Frederick Engels. 5 December 1848 | 543 |
| Jenny Marx to Caroline Scholer. 14 July, 1849 | 546 |
| Conrad Schramm to Joseph Weydemeyer. 8 June, 1850 | 548 |
| From Peter Roser's Evidence | 550 |
| Jenny Marx to Joseph Weydemeyer. 20 May 1850 | 555 |
| Jenny Marx to Joseph Weydemeyer. About 20 June 1850 | 559 |
| Jenny Marx to Frederick Engels. 19 December 1850 | 560 |
| Jenny Marx to Frederick Engels. 1 January 1851 | 561 |
| Jenny Marx to Frederick Engels. 17 December 1851 | 562 |
| Jenny Marx to Frederick Engels. 17 December 1851 | 563 |
Notes and Indexes |
| Notes | 567 |
| Name Index | 643 |
| Index of Quoted and Mentioned Literature | 676 |
| Index of Periodicals | 693 |
| Subject Index | 701 |
Illustrations |
| 8 rue Vanneau Paris, where Marx lived from October 1843 to January 1845 | 24-5 |
| Rue de l'alliance, hors de la porte de Louvain No. 5, Brussels, where Marx lived | 24-5 |
| Chetham's Library in Manchester where Marx and Engels worked in 1845 | 56-7 |
| The house in Paris where Engels lived from November 1846 to March 1847 | 56-7 |
| A page from Engels Letter to Marx of 23-24 November 1847 | 147 |
| The cafe 'Au Cygne' in Brussels where Marx delivered lectures to the Cologne Workers' Association | 152 |
| Amigo prison in Brussels, where Marx was detained in March 1848 | 153 |
| Gurzenich, a building where the Cologne Workers' Association held their meetings in 1848 and 1849 | 184-5 |
| The house in Anderson Street, London, where Marx lived from 1849 to April 1850 | 184-5 |
| A cartoon of Frederick William IV and the Prussian bourgeoisie drawn by Engels on the back of E. Voswinkel's letter to Marx 22 January-beginning of February) about the elections to the Prussian Diet (1849) | 187 |
| The house where Engels lived in Manchester | 248-9 |
| Dean Street, Soho, London, where Marx lived from 1850 to 1857 | 248-9 |
| A page from Marx's letter to Engels of 7 January 1851 | 259 |
| Heinrich Heine, P. V. Annenkov, Joseph Weydemeyer, George Julian Harney | 280-1 |
