1108 EXPKHIMKNT STATION lUiC'OUD. 



" Tli(> (dial aniDUiit <if pui-iii ('(pinpoiiiKls oxcrotod is a iiiorc (-(Histaiit (luiiii- 

 tily. liolli fnmi day lo i\:\y and al juTiods separated hy intervals of niontlis, 

 tliaii is the outitiit of urie aeid. 



" Tlie outimt of purin bases exhihils varialions. correspoiidiii;,' |u dilfereiit 

 portions of the day. which are very similar to those exliil)itrd hy the urie acid 

 output. 



"The amount of uric acid excreted tends to vary inversely, and that of tlu» 

 l>nrin hases to vary directly, with the volume of urine." 



Principles of general metabolism of matter and energy, II, (). Kktm- 

 MACiiER {Ertjch. I'hiisioL, 7 {l!)OS), pj). .'I'l'i-'i'id). — A critical sunnnai-y and 

 diiiest of data on the metal)olism of matter and energy. 



International catalogue of scientific literature. Q — Physiology (Intrnutl. 

 Cut. Hrl. Lit., G H!IO!)). fit. I. />/*. ]HI+S.i.^; 6 ( l<H)S). fit. .>. iip. .'<.W).— The l)ih- 

 Iioj,'ra[»hy of jihysioioiry, including exi)erimental psyclioloiry. pharniacoI(){;y, and 

 (experimental jiatholo^.v. previously noted (10. S. li.. 10, p. 4(58), is continued in 

 this volume, which contains material received between May, lOOO, and August, 

 1!)07. I'art 1 is the author cataloijue and part 2 the subject catalogue. 



ANIMAL PRODUCTION. 



Reports to the evolution committee, W. Bateson et al. (Rpt.t. to Evolution 

 Com. Roil. Xoc. [London], 1!)0iS, No. //, jij). 60, figs. 3). — This report is in con- 

 tinuance of prerious worli on the physiology of heredity. Investigations on 

 poultry and sweet peas are reported by W. Bateson and It. C. I'unnett, and on 

 stocks by Miss E. R. Saunders and H. B. Killby ; a preliminary account of the 

 inheritance of coat color in mice by Miss F. M. Durham; on sex inheritance in 

 the moth Abraa-as grossulariata and its variety, .1. (irossulitriald var. hiclicolor 

 by L. Doncaster; a note on the inheritance of sex in canaries l)y Miss Durham 

 and Miss D. C. E. Marryat; and a corrigenda to I'oport 3 on the factors whicli 

 produce hoariness. 



Tile work reported on i)oultry deals chietly with the factors which influence 

 the iidieritance of (a) comb structure, and (1)) white plumage. The study of 

 comb inheritance has involved over 12,500 birds, and the results of this and 

 previous work are presented in tabular form. " The rose comb is in reality a 

 single comb modified by the presence of a ' rose ' factor. The omission of this 

 factor enables the single comb to appear. The same considerations apply to 

 the pea comb, which is single plus a pea factor. The true allelomorphic pair in 

 each case is the presence of a given factor which is dominant to the absence of 

 that factor. ... As the accei)tance of the 'presence and absence' hypothesis 

 seems to demand some general expression for such interrelation between fac- 

 tors belonging to distinct allelomorphic pairs, wo propose the terms ' epistatic ' 

 and ' hypostatic' For example, the combless, the single-combed, and the rose- 

 comed conditions may, in the light of our present knowledge, be regarded as 

 forming a cumulative series and we should sjjeak of the factor for single as 

 I)eing dominant to the coml)less condition but hypostatic to the rose factor, and 

 siuularly the rose factor may be referred to as epistatic to the single." 



A walnut comb is one in which both the rose factor and the pea factor are 

 present, and such a conih may be either liomozygous or heterozygous for one? or 

 both of these factors. 



In the studies of white plumage there are two distinct classes of white fowl : 

 (a) Those in which white is dominant to color, and (b) those in which white is 

 recessive to color. The recessive whites are of at least three kinds, namely, 

 the white birds which have arisen in the course of these experiments, the white 

 of the silky fowl, and the white of the rose-comb bantams. 



