No. 486] NOTES AND LITERATURE 



403 



BOTANY 



Cytology and Mutation. - Immediately after tlie rediscoven of 

 Memlers law and \hv |.ii!)licati()ii of DeVries's great work on mnta'tion, 



organization of the germ cells. The most recent contribution to ih(> 

 literature of this subject is a paper by Gates^ on (Enothem L(im<irrkiaiin 

 and O. lata. 



The author finds that the regular abortion of the pollen iii (Enofhcm 



growth of iis lining (the tapetum) as described by Pohl, but to some 

 other agency the nature of wliich is not yet explained. Pollen (level- 



