203 

 night by mcans of this wings from one peice of water to another. 

 The latter I consider the more probable conjecture ». 



This conjecture is dissapored and certainty prevails for the Bacil- 

 laria bave been seen to come spontaneously sevcral times. And as 

 Bacillaria come spontaneously Dcsmidieae may come in the same 

 way. 1 bave the water, hard' ly the dissolving in it of Calcium car- 

 bonate (Carbonate of lime) which I got from the Boiling Spring, Ro- 

 seville, Newark, New Jersey which has Conferva in it. I got it i. 

 March 1910. I keep it to see what will grow in it. There are snails 

 in it also. l view it several times a day by means of the micro- 

 scope. I thus see now the Conferva and Bacillaria change. On the 

 2 of March there was see Cosìiiahum witch boeks like C. bioculatuni, 

 A. B., scarce, growing in it. 



It looks like fìg. 5ó, Tab. XV of The British Desmidieae It 

 is not exactly the same but has an dark centre (ovule) and swar- 

 ming dots (anthozoa) at the edge. I will look at it daily and report. 



■^-^^!^Ì^^<=5*^' 



