THE ANNALS AND MAGAZINE OF NATURAL HISTORY. [SECOND SERIES.] No. 110. FEBRUARY 1857. IX. — On the Organization of the Infusoria, especially the Vorti-cellse. 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 Infusoriat-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, except 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 Vorticella and Acineta 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 Archiv, 1856, p. 340, by W. S. Dallas, F.L.S. t Untersuchungen iiber die Entwickelung der Infusorien ; Wiegmann's Archiv, 1840, p. 91. Neue Beitrage zur Kenntniss der Entwickelungs-geschichte und des feineren Baues der Infusorien ; Siebold iind KoUiker's Zeitschrift, iii. p. 475. (Translated, Annals, new series, vol. ix. p. 471 •) X Aratlicher Bericht der Naturforscherversaramlung zu Bremen, 1844, p. 110. § Siebold und KoUiker's Zeitschrift, iii. p. 277. Ann. ^ Mag. N. Hist. Ser. 2. Vol. xix. 8
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