392 SCIENCE PROGRESS 



and dorsal sulci are not constant enough to form a diagnostic 

 character of any value. The papillae on the lateral borders are 

 provided with papillae of a similar form in all species, although 

 in the chimpanzee and gibbons they include all the lateral 

 organs while in the gorilla and orang they only include a part. 

 Other papers include : 



Bremer, " Recurrent Branches of the Abducens Nerve in Human Em- 

 bryos" {Amer. Journ. Anat., vol. 28, No. 2, Jan. 1921) ; Gibson, " Note on a 

 Persistent Left Duct of Cuvier " {Anat. Rec, vol. 20, No. 4, March 1921) ; 

 Hagstrom, " Die Entwicklung der Thymus beim Rind " {Anat. Anz., Bd. 53, 

 March 1921) ; Heuser, " The Early Establishment of the Intestinal Nutrition 

 in the Opossum. The Digestive System just before and soon after Birth " 

 {Amer. Journ. Anat., vol. 28, No. 2, Jan. 1921) ; Jordan, "Further Evidences 

 Concerning the Function of the Osteoclasts " {Anat. Rec, vol. 20, No. 3, Feb. 

 1 921) ; King, " A Comparative Study of the Birth Mortality in the Albino 

 Rat and Man" {ihid.. No. 4, March 1921) ; Kudo, " Studies on the Effects of 

 Thirst. I. Effects of Thirst on the Weights of the Various Organs and Systems 

 of Adult Albino Rats " {Amer. Journ. Anat., vol. 28, No. 2, Jan. 1921) ; Miller. 

 " Demonstration of the Cartilaginous Skeleton in Mammalian Fetuses " 

 {Anat. Rec, vol. 20, No. 4, March 1921) ; Nanagas, " Two Cases of Mono- 

 ventricular Heart with Atresia and Transposition of some of the Roots of 

 the Great Vessels " {ibid.. No. 3, Feb. 1921) ; Nordkemper, " Zur Frage der 

 Umschaltung der parasympathishen vagusanteile im Ggl. nodosum und Ggl. 

 jugulare " {Anat. Anz., Bd. 53, Jan. 1921) ; Peter, " Die Darstellung der 

 Entwicklung der Knochen " {ibid., Jan. 1921) ; Rasmussen, " The Hypo- 

 physis Cerebri of the Wood chuck {Marmota monax), with special reference to 

 Hibernation and Inanition " {Endocrin., vol. 5, No. i, Jan. 1921) ; Siperstein, 

 " The Effects of Acute and Chronic Inanition upon the Development and 

 Structure of the Testis in the Albino Rat" {Anat. Rec, vol. 20, No. 4, March 

 1 921) ; Sonntag, " A Contribution to the Anatomy of the Three-toed Sloth, 

 Bradypus tridactylus" {Proc Zool. Soc, pt. i, March 1921) ; Thiel and 

 Downey, " The Development of the Mammalian Spleen, with Special Refer- 

 ence to its Hematopoietic Activity" {Amer. Journ. Anat., vol. 28, No. 2, Jan. 

 1921) ; and Vermooten, " A Study of the Fracture of the Epistropheus due 

 to Hanging, with a Note on the Possible Causes of Death" {Anat. Rec, vol. 20, 

 No. 3, Feb. 1921). 



General. — Darwin and Collins in " A Universal Microtome " 

 {Journ. Ray. Micro. Soc, Sept. 192 1) give a description of a 

 new type of microtome. It combines the good features of the 

 old Cambridge rocking microtome and eliminates some of its 

 disadvantages. The sections are cut flat instead of on the arc 

 of a circle, and the knife is held rigid while the block itself 

 is moved. It will cut objects that are frozen, embedded in 

 paraffin or celloidin, and should prove a valuable instrument in 

 the laboratory, since it also avoids some of the disadvantages of 

 the rotary forms. 



Hogben discusses " The Problem of Synapsis " {ibid., Sept. 

 1920). The author points out that almost all workers agree that 

 there is evidence to show that the chromatin elements conjugate, 

 certain authors also claim that such elements are chromosomes 

 sensu stricto ; but the fusion is so complete in parasynapsis that 



