16 



sperms (COULTER and CJIAltBl^LAIF, '03, pp. 165-6, 172), and 

 in the developing embryo sac (ibid,, p. 67), In certain 

 Legiuninosae, GUIGITARD ('81) reports simultaneous nuclear 

 division in the cells of the suspensor. The second mitosis 

 in the gonotokonts of Arche^oniates is simultaneous in the 

 tv/o nuclei, 



SCHjvIITZ, in his studies on the nuclei of Siphono- 

 cliadacea.e (*79, b,c) does not discuss the question of sim- 

 ultaneity of nuclear division, but leaves the reader to in- 

 fer that the mitoses in a cell do not occur a.t the same 

 time. The same is true of B^THeiB'S work on Godium ('81), 

 and of FAIRCEILD'S account of Valonia (^4) , 



Approximate simultaneity of nuclear division may be 

 said to be a very general phenomenon in multinucleate plant 

 cells. 



The small si/.e of the nuclei renders Griff ith sia a 

 rather Unfavorable object for the study of the details of 

 mitosis. The follov/ing account is based on observation of 

 the nuclei in vegetative cells of the tetrasporic plants. 



The nuclei are tliroughout their history very poor in 

 linin. The chromatin of the resting nucleus is not, there- 

 fore, distributed on a linin reticulura, but is contained in 

 a centrally placed, homogeneous nucleolus, or karyosome 



