152 WALTER LAWRENCE. 



Niirnburger. 



'20 Klin und exp. Untersuchungen uber die Lebensdaur der menschlichen 

 Spermatozoen. Monatschr. f. Geb. und Gyn. Quoted from Williams 

 Obstetrics, 1923. 

 Oslund, Robt. M. 



'24 A Study of Vasectomy of Rats and Guinea Pigs. Am. Jour. Phys., Vol. 67, 



pp. 422-443. 



'25 Vasectomy on Dogs. Am. Jour. Phys., Vol. 70, p. 117. 

 Williams. 



'23 Obstetrics. P. 96. D. Appleton & Company. 

 Wolf. 



'21 The Survival of Motility in Mammalian Spermatozoa. Am. Jour. Agri. 

 Science, Vol. n, 1921. Quoted from Marshalls Physiology of Repro- 

 duction, 1922. 



