formed ant!: 



Mill d with protoplasm, eacl 

 and closely appressed to th 

 res lving side hv side. Wi 



likened to a [aii-l<-Mfc.;.ll.>s narrow rihhnns. 

 In the last division by which these cells were formed the nuclei still 



least in part be traced out alon- its very sinuous curs', hut without 

 discovering any free ends within, the nuclear cavity or any evidence of 



chromatin granules, free in the nuclear fluid. The halves of these rods 

 are exactly tin -aiue in h n_th and are united hv a common hyalo- 

 plasm and from their ends also are still projecting fine delicate threads 



poles the rods are carried to the equator and the spindle is soon com- 

 pleted. The halve - of the rods now separate, that is, the ends directed 

 towards the center or axis of the spindle, part first and the segments 

 00 their way back to the poles assume the forms of the letters U or V. 

 The two nuclei thus formed at once enter again into division and the 

 four pollen grains are perfected. 



With each nuclear division the "directive spheres" have doubled, so 

 that each new nucleus is provided with two spheres. 



For the formation of the generative or sexual nucleus proper, the 

 pollen nucleus divides to form a vegetative and generative nucleus.' 

 Within the pollen tithe the -enei ative nucleus undergoes a second 

 division, the spheres likewise doubling, and, as the plane of division is 



J By the artificial culture of pollen the generative nuc:,rr- i-ometimes .juite c-crie- 



