75 Aves. 
Subject Index. — Ethology — Aetiology. 
5823 
The ovary and ova of hybrid ducks ; 
Poll, 1076 : Hybrid ducks and sperma- 
togenesis ; Poll, 1075. 
On the activity of the ovaries in a 
Goldfinch x Canary hybrid ; Chappellier, 
256. 
Atavism in guinea-chicken hybrids ; 
Guyer, 498. 
Brewster’s Warbler, a natural hybrid ; 
Faxon, 393. 
Turdm merula mating with T. 
musicns in a feral state ; Adamson, 3. 
Snatgansblut bci Ilausganson ; 
Christoleit, 265. 
Hybrid Fringillidae ; Rostkowski, 
1170 ; Silver, 1286. 
Tliaumalea obseura , the result of 
crossing T. picta £ with T. amhersti ; 
Thomas, 1379. 
Natural hybridism between Sula 
cyanops and 8. leucogastra in the 
Philippines ; Worcester, 1523. 
Notes on hybrids between Tetrao 
tetrix x Lagopus albus ; Usakov, 1433 : 
Tetrao urogallns x Lyrurus tetrix. 
Vallon, 1438 : Pho.sianus sp. x Tetrao 
tetrix ; ScMff, 1225 : Diardigallus 
diardi x Gennaeas melanonotus ; 
Martorelli, 853 : Pavo :ristatus x 
Numida sp. ; Diaz, 331 •. Orcortyx 
pictus plumiferus x Lophortyx cali- 
fornicus ; Peck, 1036 : Columba 
palumbus G. livia domestica ; Behm, 
114 : Streptopelia risoria x Turtur 
auritus ; Tympanist ria bicolor x 
Chalcopclia . a fra ; L’Hermitte, 576 : 
Grits canadensis x O. carunculata ; 
Cosgrave, 301 : Gygnus olor x Anver 
dom.\ Gurney, 495: Anser albifrons 
x A. anser, Behm and Lbnnberg, 116 : 
Molpasles leucogenys x M. intennedius ; 
Whistler, 1489: Fringilla coelebs x 
Canary-bastard ; Schlusche, 1237 ; 
Fringilla monti fringilla x F. coelebs : 
Bonhote, 137: Vall'oni, 1438: Silver, 
1286 : Carduclis elcgans x Canary ; 
Nalle, 936 : Pyrrliula pyrrhula x P. 
cassini ; Johansen, 642 : Dendroica 
audnboni x D. coronata ; Taylor, 1356 : 
Corvus cornix x C. corone ; Simonsen, 
1290. 
Heredity and Evolution. 
Die Vorfahren der Vogel und ihre 
Lebensweise ; Abel, 2. 
Natural selection in the English 
Sparrow in America ; Harris, 527. 
On the cause of the fluctuations in 
growth of the fowls comb and its 
connection with egg-laying; Smith, 
1298. 
Another sex-limited character in 
fowls ; Sturtevant, 1338. 
Notes on two crosses between 
different races of pigeons ; Morgan, 924. 
Inheritance of fecundity in the 
domestic fowl ; Pearl, 1033. 
Further data regarding the sex- 
limited inheritance of the barred color 
pattern in poultry; Pearland Surface, 
1034. 
Webfoot character in Pigeons and 
the Mendelian law ; Bonhote, 138. 
Experiments on the inheritance of 
colour and colour pattern in Pigeons 
and its relation to the Mendelian laws ; 
Bonhote and Smalley, 143. 
Experiments in the transmission of 
hyperdactyly in fowls ; Barfurth, 88, 89. 
Atavism in Falco vespertinus ; 
Chigi, 260. 
Extinct Birds. 
Diluvial bird remains from Moravia ; 
Capek, 232. 
Bird remains from the brown coal 
formation near Briix, Bohemia ; Laube, 
748. 
The Quarternary fossil birds of 
Portugal ; Harl6, 522. 
Bird remains from prehistoric siles in 
Norway ; Grieg, 469, Petersen, 1043. 
Die Raubvogel der Quedlinburger 
Kreidebucht und der angrenzenden 
Formationen ; Kalmus, 671. 
A synopsis of our knowledge 
concerning the fossil birds of the 
Pacific coast of North America ; Miller, 
913: Avifauna of the Pleistocene cave 
deposits of California; Miller, 912: 
A series of eagle tarsi from the 
Pleistocene beds of California ; Miller, 
911: Pleistocene avifauna of Fossil 
Lake, Oregon with description of 
Aeclimophorus lucasi sp. n. ; Miller. 
910. 
Distribution of the extinct Ratitae 
with diagnoses of the groups and a 
key to the species and a description of 
