EXPERIMENTS MADE IN 1910 71 



with the result that the unheated portion became 

 turbid with Bacteria and Torulae in the course of 

 three days, while that which had been heated re- 

 mained clear and so it continued after a lapse of 

 two months. 



Again, in tube No. 144, which had been heated 

 to 135 C., my notes say that the Torulae were 

 " single or in pairs, but scarce." A specimen of 

 the deposit to which this description refers was 

 ringed with paraffin and put away in a drawer. 

 When examined, after nine days, several beauti- 

 ful groups of twenty to thirty Torulas were found 

 on the flakes of silica, where previously there had 

 only been single specimens. Though the slip 

 had been in the dark, the Torulse had grown and 

 multiplied remarkably. Perhaps the warming of 

 the film by the hot paraffin had acted as an initial 

 stimulus. 



In Plate 8, Fig. 43, the largest mass of Torulas 

 I had, up to that time, ever taken from one of 

 the previously sealed tubes is shown; while Fig. 

 44 represents a group of TorulaB, with distinct 

 vacuoles, from another tube one which had been 

 heated to 135 C. Though the organisms are less 

 varied in the colourless solutions, these fluids stand 

 the high temperatures better than the yellow solu- 



