METAMORPHOSES OF ANIMALS. 



125 



more resemble the true Fishes. In no class are renewed 

 embryological investigations, extending over a variety of 

 families, so much needed, as in that of Birds, if we desire 

 to derive any assistance in their natural classification 

 from the peculiarities of their development; and yet the 

 general development of these animals is perhaps better 

 known than that of any other type. 1 The class of Mam- 

 malia 2 has found in Bischoff a most successful and 



in 



thorough investigator. 3 



1 PANDER (Gnu. H.), Diss. sistens 

 historian! metarnorphoseos quain 

 ovum incubatum prioribus quinque 

 diebus subit ; Wirceb., 1817, 8vo. 

 Beitrage zur Entwickelungsge- 

 schichte desHlihnckens imEie, Wurzb. 

 1817, fol., fig. BAER (K. E. v.), Ent- 

 wickelungsgeschichte, etc., vol. 1. 

 DUTROCHET (H.), Histoire de 1'oeuf 

 des Oiseaux avant la ponte, Bull. 

 Soc. Philom., 1819, p. 38. HUNTER 

 (JOHN), Observations on Animal De- 

 velopment, eclited, and his Illustra- 

 tions of that process in the Bird de- 

 scribed, by R. OWEN; London, 1841, 

 fol., fig. PREVOST (J. L.), Memoire 

 sur le developpement du poulet dans 

 1'oeuf, Ann. Sc. Nat., 1827, vol. 12, p. 

 415. PUEVOST (J. L ) et LEBERT, 

 Memoires sur la formation des or- 

 ganes de la circulation et du sang 

 dans 1'ernbryon du Poulet, Ann. Sc. 

 Nat., 3e ser., i, p. 265 ; ii, 222, fig. ; 

 iii, p. 96. BAUDRIMONT (A. ),et MAR- 

 TIN ST. ANGE (G. J.), Recherches 

 anatomiques et physiologiques sur le 

 developpement du fojtus ; Paris,! 850, 

 4to. MECKEL v. HEMSBACH (II.), 

 Die Bildung der fiir partielle Furch- 

 ung bestirnmten Eier der Vogel, etc., 

 Zeitsch. f. wiss. Zocl., 1852, vol. iii, 

 p. 420. DARESTE (C.), Memoire sur 

 1'influence qu'exercesur le developpe- 

 ment du poulet 1'application partielle 

 d'un vernis sur la coquille de 1'oeuf, 

 Ann. Sc. Nat., 4e ser., 1855, vol. 4. 

 WEINLAND (D.), On the Armature of 

 the Lower Bill of the Hatching 

 Tringa Fusilla, Wils., Proc. Essex In- 



stitute, Salern, vol. 2, p. 33. HOYER 

 (H.), Ueber die Eifollikel, der Vogel, 

 Muller's Arch., 1857, p. 52. HOR- 

 NER (F. R.), On some discoveries 

 relative to the Chick in ovo, and its 

 liberation from the shell, Proc. Brit. 

 Ass., 1853, p. 68. 



2 For the papers relating to the 

 foetal envelopes and the placenta, and 

 also to the different systems of organs 

 or any organ in particular, and for 

 human embryology generally, see 

 Bischoff's article " Entwickelungs- 

 geschichte," in R. Wagner's Hand- 

 worterbuch der Physiologie, p. 867, 

 where everything that has been 

 done in this direction, up to the year 

 1843, is enumerated. For more re- 

 cent researches upon these topics, 

 consult also, MULLER'S Archiv, WIEG- 

 MAN'S Archiv, SIEBOLD und KOLLI- 

 KER'S Zeitsch. f. wiss. Zool., MILNE- 

 EDWARDS, Ann. Sc. Nat., and the 

 Annals and Magazine of Nat. Hist., 

 etc 



3 BISCHOFF (Tn.L.W.), Entwickel- 

 ungsgeschichte des Kaninchen-Eies, 

 Braunschweig, 1842, 4to. fig. Ent- 

 wickelungsgeschichte des Huude- 

 Eics, Braunschweig, 1845, 4to. fig. 

 Entwickelungsgeschichte des Meer- 

 schweinchens, Giessen, 1852, 4to. 

 fig. Entwickelungsgeschichte des 

 Rehes, Giessen, 1854, 4to. fig. PRE- 

 VOST (J. L.), et DUMAS (J. A.), De 

 la generation chez les Mamrniferes, 

 etc., Ann. Sc. Nat., 1824, vol. 3, p. 

 113, fig. BOJANUS (L.), Observatio 

 anatomica de fcetu canino 24 dierum, 



