346 
are described as being opalescent. All, therefore, acted zymo- 
tically in different degrees. 
All of the eprouvettes were plugged with cotton wool. As 
in previous experiments, the quantity of water introduced 
was in each case measured with the same pipette, which was 
immersed in boiling distilled water for a few minutes between 
each impregnation. A check eprouvette was then impreg- 
nated in the same way as the rest with the water in which 
the pipette was washed. It remains to the present moment 
perfectly transparent and barren. 
Excepting in so far as this experiment shows that filtra- 
tion exercises no perceptible influence on the zymotic power 
of water, no conclusion can be drawn from the comparison 
of the results. It happens that the water designated C 
stands considerably higher than the rest, and that designated 
A considerably lower. It would be premature, however, to 
attach importance to this fact. 
Section III.—Circumstances which Determine the Existence 
of Microzymes in Organic Inquids and Tissues. 
The experiments to be related in the following paragraphs 
were undertaken for the purpose of ascertaining whether the 
tissues and liquids of the living body participate in the 
zymotic property which has been shown to exist in ordinary 
water and moist substances: in other words, whether the 
living matter with which the body is in constant contact by 
its external surface penetrates into its interior.! 
XXI.—March 24.—A glass canula of suitable size, which 
had just been drawn, was introduced into the carotid artery 
of a rabbit, and secured with a ligature. The arterial blood 
as it flowed from the canula was received into four ordinary 
test glasses (marked a, a, and 4, b), and into an eprouvette 
(marked c). The quantities of blood collected in a, a were 
mixed with boiled and cooled distilled water, and left freely 
exposed under a bell jar. In two or three days bacteria 
appeared and the liquid became offensive. The quantity in 
b, 6 was left undiluted, and each glass was covered with a 
layer of cotton wool. On the 30th they remained unaltered, 
1 As to the existence of visible microzymes in the liquids of persons 
affected with contagious diseases, I had already satisfied myself that I could 
not accept Hallier’s observations ; for on examining the blood of patients 
affected with scarlatina (in which, according to Hallier’s statement, micro- 
coccus is constantly observed and very abundant) at all stages of the disease, 
T had found that no such bodies existed init. It does not, however, follow 
from this that organisms are not present potentially, z.c.in the form of 
germinal particles not distinguishable by the microscope. 
