Nos. 45I 452-] STUDIES ON THE PLANT CELL. 



of the blepharoplas 

 regarded by the latt 

 Ikeno are iticHned t 

 that is unusual sincx 

 it a i)lace in the cc 



Intranuclear centrosomes ha\ e been u pni ted ii 

 forms but they do not lea\e tlic mu U'Us in ihe n 

 by Ikeno. 



On the whole the writer is nv.re in Muipatli) 

 of Webber (:oi,pp. 70 t<> '"^O, Strasbm-vr 

 those of the other authors. Assunung that t 

 upon the cycads and (iinko are correct, Well 

 justified in emphasizing the striking fact that th 

 are completely independent of the spindle in X.Y 

 that they are formed de novo at a distance tn 

 These are peculiarities which, if established 

 out spermatogenesis in plants, will remove the p 

 from the activities of centrosomes in certain tl 

 Stypocaulon, Dictyota) and in many animal tell: 

 to be expected that a centrosome uhen i)resent 



len the oh 

 -ith those 



sent the 



whethei 

 in the 



