[256] _Recherches sur la generation des Mammiferes_. Report by Academy Committee. _Ann. Sci. nat._ (2) (_Zool._) ii., pp. 1-18, 1834; also _Embryogenie comparee_, 1837. [257] _Lond. and Edin. Phil. Mag._ (3) vii., 1835; _Phil. Trans._ 1837. [258] _Handbuch der Enfwickelungsgeschichte_, 1835, and Mueller's _Archiv_, 1836. [259] _Prodromus historiae generationis hominis atque animalium_, Lipsiae, 1836. [260] Mueller's _Archiv_, 1837. [261] Sachs, _History of Botany_, Book ii. [262] _Ann. Sci. nat._, i., pp. 110-14, 1824. Swammerdam is said to have observed the 2-celled stage in the egg of the frog (_Bibl. Nat._, 1752), and Roesel v. Rosenhof the same stage in the tree-frog (_Hist. nat. ranarum nostratium_, 1758). [263] _Developpement de la grenouille commune_, Milan, 1826. _Biblioteca italiana_, lxxix., 1836, and Mueller's _Archiv_, 1836. Agassiz is said by Vogt (1842) to have seen segmentation in the Perch as early as 1831. [264] Mueller's _Archiv_, 1836. [265] In Burdach, _Die Physiologie als Erfahrungswissenschaft_, 2nd Ed., vol. ii. [266] Wiegmann's _Archiv_, 1837. [267] _Bericht Versamml. deutsch. Naturf. in Prag_, 1837. [268] _Bericht Versamm. deutsch. Naturf. in Freiburg_, 1838. Later in his _Entw. d. Wirbelth_., and in his papers on the development of the rabbit. [269] _Phil. Trans._, 1839. See particularly Pl. vi., figs. 105-12. [270] _Embryologie des Salmones_ 1842. [271] Mueller's _Archiv_, 1847. [272] _C.R. Acad. Sci._, xxx., p. 638. [273] See review by Leydig in _Isis_, 1848, pp. 161-193. [274] Mueller's _Archiv_, pp. 89-102, 1841. [275] _De evolution Stronzyli auric. el Ascaridis acum._, Erlangen, 1841. [276] Mueller's _Archiv_, pp. 66-141, 1843. [277] _Entwickelungsgeschichte der Cephalopoden_, Zurich, 1844. [278] _Froriep's Notizen_, No. 800, 1846. [279] _Isis_, 1848. [280] Mueller's _Archiv_, p. 47, 1852, also 1854 and 1858. [281] See particularly Plate IX., figs. 3-7. [282] _Hist.-krit. Bemerkungen zu den neuesten Mittheilungen ue. d. erste Entwickelung d. Saeugethiereier_, Muenchen, 1877. [283] _Monatsber. Akad. Wiss. Berlin_, 1851. [284] _Zur Lehre von Generationswechsel u. d. Fortpflanzen d. Medusen u. Polypen_. [285] _U. d. Bau u. d. system. Stellung d. Raederthiere_, 1854. [286] _Arch f. path. Anat. Phys._, vii., pp. 1-39, 1854. Also in his _Beitraege z. spec. Path. u. Therapie_. [287] _Die Cellularpathologie_, Berlin, 1858. [288] _Lehrbuch der Histologie_, 1857. [289] _Ann, Sci. nat._ (2) iii., pp. 108-9 and pp. 312-4, 1835. Also iv, pp. 343-77. [290] 1839 or 1840. [2913] _Nova Acta Acad. Leop._, xxii., 1850. Trans. in 1853 for Ray Society. [292] _Arch. f. Anat. u. Physiol._, pp. 1-27, 1861. CHAPTER XII