232 MICHAEL F. GUYER. 



nucleoli of the primary sperm atocyte and the two eccentric 

 chromosomes seen in the spermatogonia. 



8. It is probable that in man and certain other vertebrates, 

 as in the insects, myriapods and arachnids, the accessory chro- 

 mosomes are in some way associated with the determination 



of sex. 



LITERATURE. 

 Bardeleben, K. von 



'92 Ueber Spermatogenese bei Saugetieren. Verhandl. Anat. Gesellsch. Wien. 

 '97 Beitrage zur Histologie des Hodens und zur Spermatogenese beim Menschen. 



Arch. f. Anat. und Physiol., Anat. Abth., Supplement. 

 '98 Weitcre Beitrage zur Spermatogenese beim Menschen. Jenaische Zeitschr. 



f. Naturw., XXXI. 

 Duesberg, J. 



'06 Sur Ic nombre des chromosomes chez 1'homme. Anat. Anz., XXVIII. 

 Flemming, Von W. 



'81 Beitrage zur Kenntnis der Zelle, III. Arch. f. mikr. Anat., XX. 

 '97 Ueber die Chromosomenzahl beim Menschen. Anat. Anz., XIV. 

 Guyer, M. F. 



'02 Hybridism and the Germ-Cell. Univ. of Cincinnati Bull., Scr. II., Vol. 



II., No. 21. 

 '03 Spermatogenesis of Normal and of Hybrid Pigeons. Reprint of an earlier 



('oo) thesis. Univ. of Cincinnati Bui., Ser. II., Vol. III., No. 22. 

 '09a The Spermatogenesis of the Guinea. Anat. Anz., XXXIV., Nos. 20-21. 

 '09b The Spermatogenesis of the Domestic Chicken. Anat. Anz., XXXIV., 



Nos. 22-24. 

 Hansemann 



'91 Ueber pathologische Mitosen. Virchovv's Archiv, CXXIII. 



'93 Studien iiber die Specificitat, der Altruismus und die Anaplasie der Zelle, 



etc., p. 64. 

 Morgan, T. H. 



'10 A Biological and Cytological Study of Sex Determination in Phylloxerans 



and Aphids. Jour. Exp. Zool., VII., 2. 

 Morse, Max 



'09 The Nuclear Components of the Sex Cells of Four Species of Cockroaches. 



Arch. f. Zellforsch., III., 3. 

 Payne, Fernandus 



'09 Some New Types of Chromosome Distribution and their Relation to Sex. 



Biol. Bull., XVI. 

 Wilcox, E. V. 



'00 Human Spermatogenesis. Anat. Anz., XVII. 

 Wilson, E. B. 



'05 Studies on Chromosomes, I., II. Jour. Exp. Zool., II. 



'06 Studies, etc., III. Ibid., III. 



'09a Recent Researches on the Determination and Heredity of Sex. Science, 



XXIX., Jan. 8. 

 '09b Studies on Chromosomes, IV., V. Jour. Exp. Zool., VI. 



