368 BOTANICAL GAZETTE [NOVEMBER 



31. STEVENS, N. M., Studies in spermatogenesis with special reference to the 

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 1905. 



32. - , Studies in spermatogenesis. II. A comparative study of the 

 heterochromosomes in certain species of Coleoptera, Hemiptera, and 

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 Carnegie Institution of Washington. 1906. 



33. - , A study of the germ cells of certain Diptera with reference to the 

 heterochromosomes and the phenomena of synapsis. Jour. Exp. Zool. 



5 : 359-374- pis. 4- iQ8. 



34. - , The chromosomes in Diabrotica mttata, Diabrotica soror, and 

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35. STRASBURGER, E., Versuche mit dioicischen Pflanzen in Riicksicht auf 

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 753-785- figs. 5- 1900. 



36. - , Ueber geschlechtbestimmende Ursachen. Jahrb. Wiss. Bot. 

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37. STURTEVANT, A. H., Another sex-limited character in fowls. Science N.S. 

 33 : 337-338. 1911. 



38. WILSON, E. B., Studies on chromosomes. II. The paired microchro- 

 mosomes, idiochromosomes, and heterotropic chromosomes in Hemiptera. 

 Jour. Exp. Zool. 2:507-545. ^gs. 4. 1905. 



39. - , Studies on chromosomes. III. The sexual differences of the 

 chromosome groups in Hemiptera, with some considerations on the deter- 

 mination and inheritance of sex. Jour.- Exp. Zool. 3:1-40. figs. 6. 1906. 



40. - , Studies on chromosomes. IV. The " accessory" chromosome in 

 Syromastes and Pyrrochoris, with a comparative review of the types of 

 sexual differences of the chromosome groups. Jour. Exp. Zool. 6:69-99. 

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41* - , Recent researches on the determination and heredity of sex. 



Science N.S. 29:53-70. 1909. 

 42. - , The chromosomes in relation to the determination of sex. 



Science Prog. no. 16, pp. 570-592. figs. j. 1910. 



