1909I SCHAFFNER— REDUCTION DIVISION IN AGAVE 211 



■ 



14. The multipolar spindles observed are explained as artifacts, 



mostly produced by cutting. 



15. The chromosomes divide transversely during metakinesis. 



16. In the daughter nuclei, irregular masses of chromatin persist 

 into the resting condition. These masses represent parts of the 

 twelve daughter chromosomes. 



17. In the second division the chromosomes divide longitudinally. 



Ohio State University 



Columbus 



LITERATURE CITED 



Rosen-berg, O., Ueber die Individualitat der Chromosomen im Pflanzenreich. 

 Flora 93 : 25 1-259. *9°4- 



J 



Dikotylen. Tahrb. Wiss 



6 



Miyake, K., Ueber Reduktionsteilung in den Pollenmutterzellen einiger Mono- 



kotylen. Jahrb. Wiss. Bot. 42:83-120. 1905. 

 Farmer, J. B., and Moore, J. E. S., On the maiotic phase (reduction division) 



in animals and plants. Quart. Jour. Mic. Sci. 48:489-556- *9°S- 

 Mother, D. M., The development of the heterotypic chromosomes in pollen 



mother cells. Annals of Botany 2 1 : 309-347. 1907. 

 jChaff.ver, J. H., The division of the macrospore nucleus. 

 430-452. 1897. 

 , A contribution to the life history and cytology of Erythronium. Bot. 



Gazette 31:369-387- 1901. 



, Chromosome reduction in the microsporocytes of Lilium tignnum. 



Bot. Gazette 23: 



Bot. Gazette 41: 183-191. 1906. 



Slimier, F. C., The soermatoirem 

 223-272. 1899. 



Tour. Morph. 15 = 



Gmggs, R. F., A reducing division in Ascaris. Ohio Nat. 6: 519-527- ^ 

 ^mer, E. L., The development of the microsporangia and microspores of 

 Hemerocallis julva. Box. Gazette 28:81-88. 1899. 



46:1 ~34. 1908. 



rubrinervis. Bot. Gazette 



EXPLANATION OF PLATES XII-XiV 

 The plates are reduced five-eighths in reproduction. Figs. 2a, ua, 14a, i6a> 



sinn u-' 2 ° a ' 20b > 20c were dr awn with a compensating ocular 18 and oil immer- 

 •on objective *; all the rest with a compensating ocular 12 and oil immersion 



J aiv e TV, the latter combination havine a magnification on the table of 2250. 



