81 Aves . 
Subject Index. — Aetiology. 
5823 
Early stages in the formation of 
double embryos in the chick ; Tur, 
1418. 
An interesting double-monstrosity 
chick ; Bruckner, 212. 
Coppia di. polli ( Qallus dornesticus) 
in parabiosi ; Fasiani, 409. 
Ursachen der Seiden- und Wollfeder- 
bildung bei Huhnern ; Taubert, 1360. 
A case of familial malformation in 
a fowl’s head ; Turnbull, 1419. 
Abnorme Schnabelform bei Nucifragci 
caryocalacles ; Charlemagne, 263. 
On an abnormally crested Canada 
Goose ; Phillips, 1049. 
Dio Varianten der Hyperdaktylie 
beim Iluhn ; Matthiass, 874. 
Polydactyly in Butreron capelli 
from Borneo ; Moulton, 931. 
A three-toed Ostrich chick, a mcristic 
variation ; Hewitt, 614. 
Hybrids. 
Studies in hybridization, Columba 
palumbus x Columba livia dom. ; Fries, 
454. 
Experiments in cross-breeding in 
various races of fowls ; Rogers, 1122. 
Characters in mongrel vs. pure-bred 
individuals among Poultry ; Daven- 
port, 338. 
Hybridizing game birds in captivity ; 
Evans, 404. 
Ibridismo gonesi di specio ; Ghigi, 
482. 
The unlike results of reciprocally 
hybridizing Reeves’s Pheasant and the 
common Ring-neck ; Phillips, 1047. 
Influence of hybridization on the 
eggs ; Pelt-Lechner, 1037. 
Exhibition of, and remarks on, a 
number of hybrids between different 
species of birds ; Rothschild, 1144. 
Helminthophila leucobranchialis 
proved to be a natural hybrid between 
H; chrysoptera and H. pinus ; Faxon, 
411. 
Notices of hybrids between : Tetrao 
urogallusxTetrao tetrix ; Kirk, 713: 
Caccabis saxatilis X C. rubra ; Marto- 
relli, 851 : Euplocamus nycthemerus 
and E. swinhoii ; Mudge, 935 : Phasi- 
(n-9242 g) 
anus x Qallus ; Fries, 455 ; Phasianus 
(Ring-neck) xGallus (Bantam); Whee- 
ler, 1498 : Pa vo nigripennis X Gallus 
dom,, Calophasis mikadoxG. ellioti 
Gallus varius x G. gallus ; Seth-Smith, 
1243 : Anas penelope X A. crecca ; 
Smith, 1284. 
Heredity and Evolution. 
A review of the origin and descent 
of birds ; Heilmann, 572. 
On the behavior of geographic 
races at tho margins of their habitats ; 
Grinnell & Swarth, 517. 
Generalities on sexual selection 
among birds ; Pycraft, 1071. 
Arguments against the monogenetic 
origin of the domestic fowl from Gallus 
bankiva ; Ghigi, 483. 
Evoluzione della piuma in schiavitu ; 
Martorelli, 852. 
Inheritance of hatching quality of 
eggs in poultry ; Pearl, 1026 : inherit- 
ance in the case of special breeds of 
egg-producing hens ; Pearl, 1027 : 
the mode of inheritance of fecundity in 
the domestic fowl ; Pearl, 1028. 
Sex-limited inheritance in poultry ; 
Davenport, 339 : the laws of the 
inheritance of special characteristics 
in domestic fowl ; Davenport, 340. 
An experiment dealing with sex- 
linkage in fowls ; Sturtevant, 1335. 
Partial sex-linkage in tho pigeon ; 
Bridges, 204. 
Barred plumage latent in White 
Leghorn fowls ; Hadley, 535. 
The effect of castration on the 
secondary soxual characters of Brown 
Leghorns ; Goodale, 494. 
Experimental researches in breeding 
Ducks ; Goldschmidt, 493. 
Size inheritance in ducks ; Phillips, 
1052. 
Influence of the male on the coloura- 
tion of the egg ; Heinroth, 575. 
The evolution of the adaptation of 
Cuckoos’ eggs to resemble those of the 
foster-bird ; Baker, 74. 
Experiments in transplantation of 
skin and organs in hybrids ; Schulz, 
1220. 
d 13 
