73 Aves , Subject Index.— Physiology — Development — Ethology. 5819 
The specific gravity and the mechan- 
ism of submergence in wator birds ; 
Stubbs, 1457. 
How to tell the age of the partridge ; 
Bureau, 188. 
DEVELOPMENT. 5815 
On the embryology of the Penguin — 
a study in embryonic regression and 
progression ; Waterston & Geddes, 
1610. 
An experimental study on the de- 
velopment of the vascular area of 
the chick blastoderm; Patterson, 1148. 
Study of the early cleavage and 
accessory cleavage of the Hen’s egg ; 
Patterson, 1146, 1147. 
On the germinal disc in naturally 
incubated eggs of Passer domeslicus ; 
Patten, 1143. 
Nouvollcs observations sur la cap- 
sulo vitolli.no do l’oouf du Merle eoinmun; 
Lecaillon, 846, 847. 
Sur la structure et la signification 
do la membrane qui enveloppo la 
sphero vitelline de l’oeuf des Oiseaux ; 
Lecaillon, 843. 
Researches on the primitive streak 
of hen’s egg. (Japanese) ; Terazaki, 
1482. 
Ueber die Chondriosomen der Urges- 
chlechtszellcn bei Vogelembryonen; 
Tschaschin, 1552. 
Entwicklung der Urgeschlechts- 
zellen bei Vogelembryonen (Russ.); 
fiasin, 260. 
The transformations in the fats 
in the hen’s egg during development ; 
Eaves, 396. 
Ueber den makro- und milcrochemis- 
chen Eisennachweis im Dotter des Huh- 
nereis ; Wassermann, 1609. 
Experience sur l’influence des rayons 
du radium sur les embryons du Canard ; 
Tur, 1566. 
L’azione del radio sull’uovo di polio ; 
Vernoni, 1589. 
Two cases of abnormal chick em- 
bryos (Japanese) ; Yoshida, 1695. 
Keimzcllonbildung bei Mischlingen ; 
Poll, 1188. 
Duplicity in chick embryos and a 
case of ovum in ovo ; O’Donoghue, 
1077. 
Ei im Ei ; Kummer, 828. 
Observations sur les ocufs doubles 
“ sans blastodermes ” ; l’ur, 1567. 
A triple yolked hen’s egg ; Pearl, 
1149. 
Sur l’accroissement de l’aire vascu- 
laire des embryons d’oiseaux normaux 
et platyneuriques ; l*ur, 1568. 
The non-fertilisecl egg of birds ; 
its degeneration changes ; the re- 
semblances betAveen normal and par- 
thenogenetic segmentation ; the in- 
fluence of temperature on segmenta- 
tion ; the variation in the number 
of chromosomes ; Lecaillon, 844, 845, 
848, 849, 850. 
On the origin and development of 
the autonomic nervous mechanism 
of the alimentary canal in the bird ; 
Abel, 1. 
Tho origin and development of tho 
somites in tho chick ; Williams, 1661 , 
On the early stages of the develop- 
ment of the vertebral column in rep- 
tiles and birds; Bruni, 181. 
On secondary occlusions of portions 
of the intestinal tract during early 
development in birds ; Livini, 887. 
On the early stages in the develop- 
ment of the Bursa Fabricii ; Jolly, 
745. 
On the development of the pulmonary 
apparatus in birds ; Livini, 886. 
On the question of the persistence 
of the Wolffian duct in the females 
of certain birds ; Cliappellier, 282. 
Wovon hiingt der Entwicklungsgrad, 
den ein Vogel vor dem Durchbruche 
der Eischale erreichen kann, ab ? 
Rosa, 1277. 
Note sur un proccd6 embryoscopique 
applicable aux ceufs d’oiseaux; Ra- 
baud, 1207. 
Mauserverlauf ; Heinroth, 628. 
ETHOLOGY. 5819 
General. 
The ecological succession of birds ; 
Adams, 4. 
Observations on the natural increase 
and decrease of tho numbers of birds ; 
Chaignon, 268. 
