368 BOTANICAL GAZETTE [NOVEMBER 
31. STEVENS, N. M., Studies in spermatogenesis with special reference to the 
“accessory chromosome.” Pub. 36, Carnegie Institution of Washington. 
Tone. 
32. ———,, Studies in spermatogenesis. II. A comparative study of the 
boo cicciiosomes in certain species of Coleoptera, Hemiptera, ve 
Lepidoptera, with special reference to sex determination. Pub. 
Carnegie Institution of Washington. 1906. 
, A study of the germ cells of certain Diptera with reference to the 
aeedchieanes and the phenomena of synapsis. Jour. Exp. L 
5*359-374. pls. 4. 1908. 
——, The chromosomes in Diabrotica vittata; Diabrotica soror, and 
© Dibtiolics 12-punctata. Jour. Exp. Zool. 5:453-470. pls. 3. 1908. 
35- STRASBURGER, E., Versuche mit dioicischen Pflanzen in piaiaet auf 
ae Biol. Centralbl. 20:657-665, 689-698, 721-731; 
753-785. figs. 5. 
, Ueber Si idstetinnccd Ursachen. Jahrb. Wiss. Bot. 
48:427-520. pls. 2. 1910. 
37- STURTEVANT, A. H., Another sex-limited character in fowls. Science N.S. 
33: 337-338. 1911. 
38. Wutson, E. B., Studies on chromosomes. II. The paired microchro- 
mosomes, idiochromosomes, and uence chromosomes in Hemiptera. 
Jour. Exp. Zool. 2:507-545. figs. 4. 1905. 
39. , Studies on chromosomes. on 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 
Ses niicies and Pyrrochoris, with a comparative review of the types of 
sexual differences of the chromosome groups. Jour. Exp. Zool. 6: 69-99- 
pls. 2. fig. 1. 1900. 
41. ———,, Recent researches on the es and heredity of sex. 
Sclence N.S: 29: 53-70. 1900. 
e chromosomes in relation to the determination of SeX 
Science Pig no. 16, pp. 570-592. figs. 3. I9gIo. 
36. 
42. 
