102 
Proceedings of Roycd Society of Edinburgh. [jan. 31, 
microscope, it was observed that on running in between the slide 
and cover-slip the solution of salicylic acid, the cellulose walls of 
hyphse, conidia, conidiophores were all perforated, and ultimately 
dissolved by the acid. 
Fig. 3. — A, Bacillus subtilis (much enlarged). B, <—€ = Direction of 
flow of salicylic acid solution. 
N.B . — In fig. 3 B tlie cell-walls should be thinner (than in woodcut) and 
perforated, especially on the observer’s right. 
6. Vaccine Lymph.] 
The micrococcus vaccinise, which is the active principle of the 
vaccine virus (as shown by Pasteur, and not the fluid medium in 
which these micrococci live their life-histories), is also acted upon 
by salicylic acid, for the lymph so treated loses its power of 
inoculation. 
7. Micrococcus urece (Von Tieghem). 
Micrococcus urece , or the zymogenic ferment of urine which 
splits up urea into ammonium carbonate, is found in dumb-bells, 
chains, and in the zoogloea state. If urine is allowed to stand 
until it begins to smell of ammonia, and then a drop of this urine 
examined microscopically, the Micrococcus urece will be found to 
be present. If now fresh urine (sterilised) is treated with salicylic 
acid, and then inoculated with Micrococcus urece (from the putrid 
urine), no change at all occurs in the urine, not after the elapse of 
