38 SCIENCE PROGRESS 



Studies on the Growth of the Corpus Callosum : I . On the Area of the Corpus 

 Callosum, measured on the Sagittal Section of the Albino Rat Brain " {ibid.) ; 

 Turner, " A Wax Model of a Presomite Human Embryo " {Anat. Rec, vol. 

 xix, No. 6, Nov. 1920) ; Taylor, " A New Meadow Mouse from the Cascade 

 Mountains of Washington " {Jour. Mamm., vol. i, No. 4, Aug. 1920) ; 

 Vaughan-Kirby, " The White Rhinoceros with Special Reference to its 

 Habits in Zululand " {Ann. Durban Mus., vol. ii, No. 5, March 1920) ; Vin- 

 cent and HoUenberg, " The Effects of Inanition upon the Adrenal Bodies " 

 {Endocr., vol. iv, No. 3, Sept. 1920) ; and Wieman, " Observations in Con- 

 nection with the Early Development of the Human Suprarenal Gland " 

 {Anat. Rec, vol. xix, No. 5, Oct. 1920). 



General. — ^The suggestion is put forward by Swingle in 

 " Neoteny and the Sexual Problem " {Amer. Nat., vol. liv, 

 No. 633, Aug. 1920) that the " oocytes " in Bidder's organ in 

 the Bufonidae are in reality simply overgrown spermatocytes 

 which are the remnants of a phylogenetically older and more 

 primitive reproductive period, and not to be considered as in 

 any way related to true oocytes. This earlier period corre- 

 sponds with the larval reproduction met with in certain 

 Urodela. In this case Bidder's organ is to be regarded as the 

 vestigeal remnant of an earlier and larval reproductive organ 

 of the male sex. This point of view bears on the much-dis- 

 cussed cases of hermaphroditism in the Anura. 



Other papers include : 



Adams, Burns, Hankinson, Moore, and Taylor, " Plants and Animals of 

 Mount Marcy, New York " {Ecology, vol. i, Nos. 2 and 3, 1920) ; Batson, 

 " De-electrification of Paraffin Ribbons by means of High-frequency Current " 

 {Anat. Rec, vol. xix, No. 4, Sept. 1920) ; Cowdry, " Anatomy in China " 

 {ibid., vol. XX, No. i, Dec. 1920) ; Hawkins, " Sexual Selection and Bird 

 Song" {Smithson Rep., No. 2568, 1920) ; Heilbrunn, " The Physical Effect 

 of Aucesthetics upon Living Protoplasm " {Biol. Bull., vol. xxxix. No. 6, 

 Dec.) ; Kordenat, " Contamination of Cadavers by Saccharomyces cerevisica " 

 {Anat. Rec, vol. xix, No. 2, July 1920) ; Longly, " Marine Camoufleurs and 

 their Camouflage : the Present and Prospective Significance of Facts regard- 

 ing the Colouration of Tropical Fishes " {Smithson Rep., No. 2569, 1920) ; 

 Petrunkevitch, "Standardised Microphotography " {Anat. Rec, vol. xix. 

 No. 2, Oct. 1920) ; Petronievics, " On the Law of Irreversible Evolution " 

 {Smithson Rep., No. 2565, 1920) ; Thuringer, " A Suggestion for Improve- 

 ment in Projection and Drawing Apparatus " {Anat. Rec, vol. xix. No. 3, 

 Aug. 1920). 



ANTHBOFOLOGY. By A. G. Thacker, A.R.C.S., Zoological Laboratory, 

 Cambridge. 



The racial affinities of the representatives of Homo sapiens, 

 who lived in Europe before and during the last great glacial 

 period, is a subject of unceasing interest. It has often been 

 remarked that these races do not in any way merge backwards 

 into another species of the Hominidas. They give us no direct 

 help in the solution of the problem of the origin of true man. 

 Various races still surviving give us more help — though they, 

 too, give us singularly little assistance. These Pleistocene 



