68 



in the harbour of San Francisco actually by the pound. It seems flou- 

 rish, in fact the Bacìllaria seem to flourish to a much greater extent 

 in the climate of San Francisco. But we shall see that they grow 

 plentifully where ice is common now and the water is nearly at the 

 freezing point ali the time. Hyalodiscus, the large forni, is not found 

 in England or New York. In fact Bacìllaria are not common at 

 those places. Growth is a slow process. it can only take place by 

 adding one individuai to another. But spore making is rapid, one 

 individuai can make innumerable individuals which may be like its 

 parent but smaller. 



And this is the growth and spore making of Trochiscia monili/or- 

 mis F. C. M. In growth it forms Hyalodiscus, in spore making the 

 form is Meiosi ra. 



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