EXPERIMENTS MADE IN 1910 73 



a larger amount of deposited silica than I desired, 

 in these ten new experiments the solution was 

 made with only one drop of the dilute sodium 

 silicate to the ounce of distilled water. 



After the tubes had been heated and cooled, I 

 was disappointed to find that there was scarcely 

 any deposit to be seen only a very minute quan- 

 tity in powdery form. All these tubes were at 

 first put at the end of the north balcony, facing 

 the east; but after about two and a half months 

 they were placed just inside the south window, as 

 I had by that time become disposed to believe they 

 would then be under more favourable conditions. 

 Inspection of the tubes at this time showed in 

 each a slight though distinct increase in the amount 

 of the deposit, which was of a light flocculent 

 character. 



Feeling assured that after exposure to these 

 high temperatures the tubes ought not to be opened 

 too soon, I allowed four months to elapse before 

 beginning to examine any of the tubes heated to 

 141, and just five months for those heated to 

 145 C. In almost all my previously recorded 

 experiments I had been looking for organisms, 

 and finding them, in and on the deposited silica. 

 This light flocculent sediment was, however, quite 



