262 



[\'0L. XL 



Arnoldi ( : 00) has re[)()rtc(l a variation somewhat simiUir to this 

 in Cephaloiaxvs forfimei, where he found the fiihc nuc/eiis (Hvichno; 

 amitoticallv, thus sliow^ing three free nuclei in the end of tlie pollen 

 tuhe be.side^ the irenerative cells. Arnoldi actually observed one 

 case of division of the Hihe luicieus. He also reports that the non- 

 functional male nucleus tnay divide amitoticallv in the upper part 



half the pollen o-.-ains cxaniinrd in I'.lrhhnnna rrns.upr.s. 



Juel f:()4) has found in Cupivssus ;t variation which he seems 



the pollen tuhe of this <renus he found not mcivly two sperms, hut 

 from ei^ht to ten, or even twenty in sonu' cases. Chatuherlain 



three sperm nuclei, in the same species, L/liia/i pli Ihulclphicnm, 

 he also found a number of cases of a prothallial cell cut off at one 

 side of the pollen ^rain. 



Thompson (:()r>) has re})orted that in the pollen tube of Arau- 



luimeran nuclei ;ifise from cells formed In the pollen i^rain, pri- 

 marily by une(|ual division of the Ini'u'e (•♦■ll of tli(> ])ollen grain, 

 an<! the >maller cells thus cut otV mav tlieniseive> divide until there 

 are lifre.M. or more. The.e eelK at'hr.t liaxe but the walls 



dissolve and the iniclei come to lie free in the pollen tube. Lopriori 

 believes these c.-lis are spennatoirenous cells and tin- miclei derived 

 from them male nuclei. The writer does not accept this interpre- 

 tation of Lopriori and will .ixive rea.on-^ for hi. opinion in con- 



Miyake ( :0:5) found in .l/;/r.v halsawra that the second sperm 

 nuch-us. the IuIh> inicleus, aii.l the stalk nuch-u> wlii<'li are l(>ft in 

 the upper part of the eo-n- ,fter IVrtili/ation, mav all <lividc. <.r at- 

 tempt to .livid.., before th.^v .li.inl.'U'rat.-. lb" siv. that tlu' divi- 



