APPENDIX C. xlix 



found to be composed of an aggregation of colourless and 

 blackish granules, of a multitude of minute crystalline par- 

 ticles, mostly diamond-shaped, and some rounded or ovoidal, 

 thick-walled, spore-like bodies; amongst which, and en- 

 veloped in part by them, were several mycelial tufts of a 

 fungus. A number of minute Bacteria were found distributed 

 throughout the fluid, and also a quantity of minute star-like 

 bodies (crystalline), about T 2inro" m diameter. 



No. LV. Ammonic Carbonate Solution. On the 

 eighth day the fluid showed a very faint opalescence, and a 

 slight deposit, which was found to be composed principally 

 of amorphous granules. Distributed through the fluid were 

 some small and sluggish Bacteria, though no other organisms 

 were seen. 



No. LVI. Ammonic Tartrate Solution. After twenty- 

 four hours the fluid showed the faintest opalescence, and in 

 forty-eight hours there was a slight bluish- white turbidity. In 

 seventy-two hours the turbidity was well marked, and there 

 was a very thin pellicle on the surface. When examined 

 microscopically the fluid was found to contain multitudes of 

 very active Bacteria, and the pellicle was also composed of 

 an aggregation of Bacteria. On the thirteenth day the 

 opacity had somewhat increased; there was also a well- 

 marked pellicle, and an obvious deposit. The pellicle was 

 found to be composed of Bacteria, and in the fluid there 

 were multitudes of medium-sized Bacteria and Vibriones, with 

 here and there a small Torula cell 1 . 



1 On comparing the corresponding experiments of Series XLVIII 

 LI. with those of Series LIII LVI. less difference is found than might 

 have been expected by many. The comparison of the numbers of each 

 series with one another, also reveals the interesting fact that the mere 

 presence of N, C, O, and H, is not all that is required even for the growth 

 and nutrition of the lower living things. These elements seem to lapse 

 into the new combinations constituting living matter of various kinds, 

 more easily from certain pre-existing states of combination than from 

 others. Solutions of ammonic tartrate are much more favourable 



VOL. II. d 



