456 
PHYSIOLOGY. 
purulent product, generally mixed with blood. These products 
give cause to ulcerous changes in the lining of the heart, and are 
always characterized by an obnoxious odor, discoloration, insig¬ 
nificant consistence, and a disposition to suppurating decay. 
The result is, permanent solidification of the endocardium, 
whose significance corresponds to the magnitude of the inflamma¬ 
tion and recurrence at the same place. On the one hand it is 
conditioned by the filtered products in the tissues, and on the 
other by the effused and stiffened exudation upon the free surface. 
Such conditions are found chiefly on the valves. 
{To be continued .) 
PHYSIOLOGY. 
INFLUENCE OF THE SUN UPON THE VEGETATION, VEGETABIL- 
ITY AND VIRULENCY OF THE CULTURES 
OF BACILLUS ANTHRACIS. 
By M. S. Arloing. 
In a former communication* we have shown that the solar 
radiations of July are capable of destroying, in two hours, the 
vegetability of the spores of the bacillus anthracis, when recently 
placed in a liquid nutritive culture. The effects of the sun are, 
however, far from being as rapid upon cultures already in process 
of growth. What these effects are, successively, upon the vegeta¬ 
tion, the vegetability and the viruleney of these cultures, will 
form the subject of the present discussion. 
First .—If spores of the bacillus anthracis are made to germin¬ 
ate in a dark oven, at a fructifying temperature, and afterwards, 
within from 24 to 48 hours, the cultures are removed into a 
transparent oven admitting the sun during the day, and in an ice- 
chamber during the night, it will be observed that the vegetation 
of the bacilli is not entirely arrested by the action of the solar 
rays. When coming out of the dark oven, the culture contains 
mycelium, and forms spores; where the mycelium already con- 
* See October issue. 
