314 Dr Eschricht's Inquiries concerning 



Itiquiries, Experimental and Philosophical, concerning the Ori- 

 gin of Intestinal TTorms. With a Plate. By Dr Eschricht, 

 Professor of Physiology in the University of|Copenhagen. 

 Communicated by the Author.* With a Plate. 



CONTENTS. 



Chap. I.— Historical Intboduct ion— Page 315. 

 § 1. Intestinal worms regarded as identical with corainon worms ; the theory of 

 equivocal generation generally adopted, rejected, and again adopted, 315. § 2. The 

 theory of equivocal generation applied to intestinal worms, 317. § 3. Had little 

 credit in England, 319. § 4. Much doubted after the discoveries of Professor 

 Ehrenberg concerning the infusoria, 321. § 5. Must be subjected to very severe 

 restrictions, 323. 



Chap. II.— Is constancy in External Form and Internal Structure, com- 

 patible WITH THE Theory of Spontaneous Generation ?— Page 324. 

 § 1. It does not refute the theory, 324. § 2. But makes it very doubtful, 325. 

 § 3. Particularly in respect io the Entozoa, 325. § 4. Might be considered more 

 compatible with the theory if somewhat modified, 326. § 5. Which modification, 

 however, did not prove correct in a single instance, 327. 



Chap. III.— Is complete Organization compatible with the supposed Spon- 

 taneous Generation ? — Page 327. 

 § 1. This question answered in the affirmative by Profes5y)r Burdach, 327. 

 § 2. Exposition of the phenomena by generation, 328. § 3. The analogy between 

 the formation of living bodies and crystallization refuted, 332. § 4. The analogy be- 

 tween the supposed equivocal generation and generation refuted, 333. § 5. Ex- 

 planation of equivocal generation as produced by latent life refuted, 334. 



Chap. IV.— The great Fertility of Intestinal Worms incompatible with 

 THE Hypothesis of their Spontaneous Generation— Page 335. 

 § 1. The chief characteristic of the structure in intestinal worms is an immense 

 development of the generative system, 335. § 2. Example from the Ascaris lumbri- 

 coides, 336. § 3. Example from the Strongylus inflexus, 337. § 4. And from the 

 Bothriocephalus latus and punctatus, 338. 



Chap. V. — Intestinal Worms are in all cases tuk Offspring of other Iir- 

 TESTiNAL Worms. — Page 342. 



§ 1. Helminthiasis contagious, 342. § 2. The Entozoa very commonly change 

 their abode at different periods of life, 344. § 3. Are very commonly subject to 

 metamorphoses, 347. § 4 The manner of propagation of the Entozoa supposed, 

 to be very complicated, 348. 5. The Spermatozoa are not parasitic animals, 351. 

 § 6. Several cutaneous eruptions are parasitic cryptogamous plants, communi- 

 cated by contact, 352. 



Chap. VI.— Conclusion— Pag^ 353. 

 § 1. GenersJ Remarks upon parasitical life, 353. § 2, Infusory animalcules com- 

 pared with Entozoa, 354. § 3. The two theories compared in relation to physiology, 

 354. § 4. The analogy between the supposed equivocal generation and creation 

 refuted, 355. Explanation of the Figures in Plate, 356. 



AW. 



♦ This valuable communication was -written by the author in English. We have had 

 occasion to make some verbal corrections j but the language generally is wonderfully 

 correct.— EDlTr 



