THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SECOND SERIES.] 

 No. 110. FEBRUARY 1857- 



IX. — On the Organization of the Infusoria, especially the Vorti- 

 cellre. By Dr. C. F, J. Lachmann*. 



[With a Plate.] 



In the summer of 1852, when I had the pleasure of working in 

 the laboratory of Professor J . Miiller, he called my attention 

 and that of another of his pupils, M. A. Schneider, to Stein's 

 memoirs upon the Infusoriaf. 



These memoirs, in conjunction with the older and contempora- 

 neous ones of FockeJ and Cohn§, appeared to commence a new 

 sera in the theory of the Infusoria; by their means we first ob- 

 tained information regarding their propagation, of which, up to 

 that time, we knew nothing, exce])t fissation and gemmation. 

 Important and interesting as were the facts discovered by the 

 three observers above mentioned, they still only formed the im- 

 perfect commencement of a history of the development of the 

 Infusoria, to the further advancement of which many must con- 

 tribute. Stein's observations appeared to be far from sufficient 

 to show his supposition of the connexion between the Vorticellce 

 and Acinetce as anything more than a rather vague hypothesis. 

 For this reason we endeavoured to test their correctness by our 

 own observations, and if possible either to fill up the deficiencies 

 in Stein's series of observations, or to prove his supposition to 

 be false. 



* Translated from MuUer's Aroliiv, 1856, p. 340, by W. S. Dallas, F.L.S. 



t Untersuchungen iiber die Entwickelimg der Infusorien ; Wiegmann's 

 Archiv, 1840, ]>. 91. Neue Beitrage zur Keiintniss der Entwickelungs- 

 geschichte uiid des feiueren Baues der Infusorien; Siebold und Kolliker's 

 Zeitschrift, iii. p. 475. (Translated, Annals, new series, vol. ix. p. 471.) 



X Aratliclier Bericht der Naturforscherversammlung zu Bremen, 1844, 

 p. 110. 



§ Siebold und Kolliker's Zeitschrift, iii. p. 277. 

 Ann. (Sf Mag. N. Hist. Ser. 2. Vol. xix. 8 



