86 ORIGIN OF LOWEST ORGANISMS. 



tenth day the fluid was still quite clear, and free from 

 sediment. 



No. XLIX. Ammonic Oxalate Solution. On the 



tenth day there was no distinct opalescence of the 

 fluid, but a well-marked whitish flocculent deposit. On 

 microscopical examination no Bacteria were found in 

 the fluid, and the deposit was made up by an aggrega- 

 tion of blackish and colourless granules, mixed with a 

 few crystals and a very few Torula cells all being held 

 together by a sort of mucoid matrix. In the midst of 

 this matter were found two or three very small, much 

 branched, mycelial tufts of a fungus-growth. 



^o. L. Ammonic Carbonate Solution. On the tenth 

 day the fluid showed a very faint opalescence, with a 

 small amount of deposit, and a partial non-coherent 

 scum on the surface, which, on microscopical examina- 

 tion, was found to be composed partly of amorphous 

 granules, and partly of minute Bacteria, mixed with 

 small necklace-like organisms. The fluid itself con- 

 tained, in suspension, a few small and sluggish Bacteria, 

 with a minute Torula cell here and there. 



No. LI. Ammonic Tartrate Solution after twenty- 

 four hours showed the faintest opalescence of the fluid ; 

 in forty-eight hours there was a bluish-white turbidity, 

 and in seventy-two hours the turbidity was well marked. 

 When examined microscopically the fluid was found to 

 contain multitudes of very active Bacteria. On the 

 thirteenth day the turbidity was not so well marked, 



of ten grains of the salt to the fluid ounce of distilled water ; and 

 to those which also contained sodic phosphate, three grains of 

 this were added. About half an ounce of each solution was put 

 into a one-ounce wide-mouthed bottle, and then tightly corked. 



