EXPERIMENTS MADE IN 1910 69 



ish red, gelatinous precipitate, while the fluid above 

 was perfectly clear and colourless. 



In some of my tentative experiments I had pre- 

 viously met with this same kind of change, and, 

 after a time, had found organisms, in some 

 cases, in the deposit. The new tubes of this kind 

 were, therefore, exposed with the others, in the 

 hope that they might not be quite worthless. 



All the tubes of this series have since been ex- 

 amined, and mostly in from six weeks to four 

 months from the dates of preparation; and in all, 

 except in three of the above-mentioned decomposed 

 solutions, organisms of various kinds have been 

 found in more or less abundance. 



Thus, out of the forty-three new experiments, 

 positive results have been obtained in forty of 

 them, though in seven of these latter (with colour- 

 less solutions) the tubes had been heated to 135 C. 

 for 5". In consequence of the very scanty deposit 

 in some of the tubes, the centrifuge was used, and 

 the last two minims of the solutions were then 

 alone examined, with satisfactory results. 



An examination of Plates 6-8 will, again, show 

 that the organisms have been much more varied 

 in nature in the yellow than in the colourless 

 solutions. They have yielded especially various 



