[256] Recherches sur la génération des Mammifères. Report by Academy Committee. Ann. Sci. nat. (2) (Zool.) ii., pp. 1-18, 1834; also Embryogénie comparée, 1837.
[257] Lond. and Edin. Phil. Mag. (3) vii., 1835; Phil. Trans. 1837.
[258] Handbuch der Enfwickelungsgeschichte, 1835, and Müller's Archiv, 1836.
[259] Prodromus historiæ generationis hominis atque animalium, Lipsiæ, 1836.
[260] Müller'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 Rösel v. Rosenhof the same stage in the tree-frog (Hist. nat. ranarum nostratium, 1758).
[263] Développement de la grenouille commune, Milan, 1826. Biblioteca italiana, lxxix., 1836, and Müller's Archiv, 1836. Agassiz is said by Vogt (1842) to have seen segmentation in the Perch as early as 1831.
[264] Müller's Archiv, 1836.
[265] In Burdach, Die Physiologie als Erfahrungswissenschaft, 2nd Ed., vol. ii.