1897] 



MICROSCOPICAL JOURNAL. 



323 



quantity and at one stage occupy a large part of tlie in- 

 terior of the frustule, the endochrome withering away 

 or being crowded to the sides. As the breeding season 

 approaches the interior is often dotted by innumerable 

 active little globules and two or sometimes more ova or 

 oil globules. Then in some way the contact of the an- 

 thozoa, as I have called these active little globules, and 

 the ova takes place. How, I know not for they are ex- 



Asterionella flavor. 



tremely minute and the contact is only momentary. But 

 sometime, I think that I shall see how the contact takes 

 place. At this time, or evolution, the characteristic odor, 

 the formation of trimethylamine smelling, takes place. 

 This is the ovulation of Bacillaria. It takes place in all 

 forms more or less, but is most rapid in forms which 

 occur in such enormous quantities. This form I have 

 found to be as rapid as any in coming and going. Per- 

 haps it is more so than other Bacillarian. 



