ferences in
the text are to the original pagination.

[252] _Symbolae ad ovi avium historiam_.

[253] _De ovi mammalium et hominis genesi_.

[254] _De mulierum organis_, 1672.

[255] _Ann. Sci. nat._, iii., p. 135, 1842.

[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