AVES. 
83 
TardidtR examined^ and^ as in most of them, the bones contain 
no air. 
Cullen, W. H. On the Gular Pouch of the Male Bustard {Otis 
tarda, Linn.). Ibis, 1865, pp. 143-145. 
The author has rediscovered this curious structure, the exist- 
ence of which had been doubted (c/. Ibis, 1862, pp. 107-127; J. 
f. O. 1862, pp. 137-153), in two examples of the bird examined 
by him in Bulgaria, of one of whieh he gives two figures, 
showing the orifice under the tongue and the saek expanded. 
No light is thrown on the development or applieation of this 
mysterious organ. 
Dareste, C. Investigations on Eggs with a Double Germ, and 
on the Origin of Double Monsters in Birds. Ann. & Mag. 
Nat. Hist. 3rd ser. xv. pp. 432, 433. 
The observations herein contained are of a nature purely phy- 
siological. 
Davy, J. On the Freezing of the Egg of the Common Fowl. 
Trans. Boy. Soc. Edinh. xxiii. pp. 505-513. 
The careful experiments made by the author are entirely of a 
physiological nature. They differ from those of Hunter and 
Mr. Paget, wherein the eggs were exposed to extreme artificial 
cold, and only for a short time. Dr. Davy generally made use 
of natural frost, but some experiments with freezing mixtures 
are also mentioned. The question of how mueh cold a fertile 
egg can endure without its vitality being injured seems to be 
stiU undecided. 
Dusseau, j. L. Musee Vrolik. Catalogue de la Collection 
d’ anatomic humaine, comparee et pathologique de MM. 
Ger. et W. Vrolik. Amsterdam: 1865. Boy. 8vo, pp. 464. 
The ornithological portions of this Catalogue are scattered 
about in a manner rather puzzling to the student. The follow- 
ing references to them will, we believe, serve as a guide to any 
ornithologist consulting the work — pp. 152, 153, 163-166, 177— 
182, 190, 191, 194-198, 200, 203, 207, 210, 211, 213, 231, 233, 
244-246, 253, 256, 259, 263, 264, 270, 271, 459 ; but not much 
information is contained in it that, apart from the collection, 
which is now at Amsterdam, would be found useful. 
Eudes-Deslongchamps, E. Note sur des Moisissures abondam- 
ment developpees dans Finterieur d^un oeuf de Casoar de la 
Nouvelle Hollande. Bull. Soc. Linn, de Normandie, ix. 
pp. 381-385. 
The author supposes the spores to have penetrated the egg- 
shell. 
