148 METAMOEPHOSES OF MAN 



cannot be determined by reference to the characters 

 presented by one individual, even during its entire 

 life ; it will be necessary to examine the individuals of 

 two successive generations, and to describe two forms 

 instead of one. 



Chamisso's discoveries seemed as incredible as the 

 u Adventures of Peter Schlemihl." They were 

 denied in the first instance ; but then, as they were 

 gradually confirmed by new observations, an effort 

 was made to unravel their mysteries; this, however, 

 could not be done satisfactorily so long as the facts 

 remained isolated. Besides, even the then existing 

 observations left a considerable gap in the history of 

 biphorae, which was only filled up at a much later 

 period by the works of Krohn,* Huxley, f Leuckart,J 

 and Yogt,§ to which we shall allude presently. 



quam in prole sen individuo) mutata. Verum enimvero qua lege 

 proles salparum, ut animal ab ove, imago a larva inter se differunt, 

 parum elucet." — (De Salpis.) " Es ist als gebaere die Kanpe den 

 Schmetterling, und der Schmetterling hinwiederam die Eaupe." — 

 (Eeise urn die Ercle.) Professor Huxley, who I believe was the first 

 to do ample justice to Chaniisso, has quoted, among others, the 

 above passages. 



* " Observations sur la Generation et le Developpement des 

 Biphores." — Annales des Sciences naturelles, 1846. 



t " Observations upon the Anatomy and Physiology of Salpa 

 and Pyrosoma." — Philosophical Transactions, 1851. 



% "Zoologischc Untersuchungen," zweites Heft, 1854. 



§ " Eecherches sur les Animaux inferieurs de la Mediterranee," 

 second memoir, 1859. Although Vogt's work stands last in the 

 order of publication, it is but fair to state that his observations 

 date from the year 1847, and were carried on with great care from 

 1850 to 1852, when they were communicated to the assembly of 

 Swiss naturalists. The very abundance of the materials collected 

 by this distinguished and industrious zoologist retarded the publi- 

 cation of the memoir referred to. 



