582 SCIENCE PROGRESS 



Corner has written " On the Origin of the Corpus Luteum of 

 the Sow from Both Granulosa and Theca Interna " (Amer. 

 Jonm. Anat., vol. xxvi, Sept. 1919). He has investigated a full 

 series of stages by means of various staining methods, and paid 

 particular attention to the fate of the theca interna. There is 

 no doubt in view of the evidence provided that the membrana 

 granulosa is retained intact in the sow, in spite of the previous 

 statements to the contrary, and is the main contributor to the 

 glandular cells of the corpus luteum. The whole of the theca 

 interna appears to pass into the corpus with the invading blood- 

 vessels, but its cells are apparently not converted into fibro- 

 blasts. On the other hand, they increase by mitotic division, 

 and are heavily laden with lipoid substance, so that it is probable 

 that some of the theca cells persist throughout pregnancy as 

 distinct elements of the corpus luteum. The exact fate of all 

 of them cannot be learned by the present methods, because 

 of a confusing resemblance between some of them and some of 

 the modified granulosa cells. King has continued a series of 

 " Studies on Inbreeding," in part " IV, A Further Study of the 

 Effects of Inbreeding on the Growth and Variability in Body- 

 weight of the Albino Rat " (Journ. Exp. Z00L, vol. xxix, Aug. 

 1919). Over 600 rats were examined in the sixteenth to the 

 twenty-fifth generation, of a strain inbred brother and sister 

 from the same litter only. It is noted that continued inbreeding 

 has produced no noticeable deterioration in rate of growth or 

 extent of growth. The normal body-weight was maintained 

 throughout, and a high degree of variability kept up. 

 Other papers include : 



Arey, " On the Presence of Haversian Systems in Membrane Bone " (Anat. 

 Rec, vol. xvii, Sept. 1919) ; Baldwin, " Variations in the Carotid Arteries of 

 the Rabbit" {ibid., July 1919) ; Buddington, "The Influence of Certain 

 Ductless Gland Substances on the Growth of Plant Tissues " (Biol. Bull., vol. 

 xxxvii, Sept. 1919) ; Cyriax, " A Brief Note on ' Floating ' Clavicle " (Anat. 

 Rec, vol. xvi, Aug. 1919) ; " The Development of the Sternum in Sus Scrofa " 

 (Anat. Rec, vol. xvi, Sept. 1919), and " The Ontogeny and Phylogeny of the 

 Sternum" (Amer. Journ. Anat., vol. xxvi, Sept. 1919). both by Hanson; 

 Henderson, " The Adult Lymphatic System of the Striped Ground-squirrel 

 (Spermophilus tridecemlineatus Mitchell) " (Anat. Rec, vol. xvi, July 1919) ; 

 Hunt, " Birth of Two Unequally Developed Cat Foetuses (Felts domestica) " 

 (ibid., Aug. 1919) ; Jordan, " The Histology of the Umbilical Cord of the Pig, 

 with Special Reference to the Vasculogenic and Hemopoietic Activity of its 

 Extensively Vascularised Connective Tissue " (Amer. Journ. Anat., vol. xxvi, 

 Sept. 1919) ; Komine, " Metabolic Activity of the Nervous System: III, On 

 the Amount of Non-protein Nitrogen in the Brain of Albino Rats during 

 Twenty-four Hours after Feeding " (Journ. Comp. Neur., vol. xxx, Aug. 

 1919) ; Kudo, " The Facial Musculature of the Japanese " (Journ. Morph., 

 vol. xxxii, Sept. 191 9) ; MacArthur and Doisy, " Quantitative Changes in the 



