70 
D. E. SALMON. 
carried in this way by horses. It has been communicated by 
hay, straw, manure, impregnated with the products of the exhala¬ 
tions. The cases where these matters have preserved the virus 
during three or four months are not rare, and Furstenberg cites 
unequivocal cases where hay, obtained from a stable where there 
had been pleuro-pneumonia and given to fresh animals, has still 
communicated the disease after nine months. . A stable which 
has been inhabited by one or several pleuro-pneumonia animals, 
a railroad car which has served to transport sick ones, preserves 
the virus for a very long time, and the cases are not rare where 
cattle put into a stable where there had been pleuro-pneumonia, 
have contracted the disease three or four months afterwards, if 
care had not been taken to thoroughly disinfect it.*’ 
Galtier in his Traite des Maladies Contagieuse et de la Police 
Sanitaire des Animaux Domestique, makes statements of the same 
kind. 
Dr. Mehenkel, in his report on the Etat Sanitaire des Ani¬ 
maux Domestiques for Belgium, for the year 1881, says, p. 43: 
“A statement which seems to us equally worthy of being 
mentioned in the present resume is found in one of the reports of 
Y. Laridon, of Thonront. This estimable practitioner saw the 
disease appear among the animals of an isolated farm; nothing 
could have brought here the germ of the disease. Laridon thinks 
that this outbreak of pleuro-pneumonia must be attributed to 
opening a pit where three years before cattle affected with pleuro¬ 
pneumonia had been buried.” 
I have had cases reported to me in Brooklyn where the dis¬ 
ease was started up afresh after the herd had been free from it 
for three or four years, by digging up the accumulations under 
the old stable floors. 
Fleming and Williams both say disinfection is necessary. 
Dr. Law, in his monograph on lung plague, gives a large num¬ 
ber of instances where the disease was spread by mediate con¬ 
tagion. I will not take up your time with these now. Dr. Law 
found an unequivocal case of this kind during his work in Chi¬ 
cago. On May 12, 1887, a cow at the rendering platform was 
found on post-mortem to have died of acute lung plague. She 
