38 Hallier, 
this association, constitute such a series of consecutive and well 
coordinated events in the disease as rarely has rewarded the toil 
of medical researches. And notwithstanding more remains to 
be learned than all that hitherto has been made in that kind 
of knowledge by which the mysteries of transportable pestilences 
will ere long be unmasked and exterminated or effectually con- 
trolled. And when we consider that, had it been a human pesti- 
lence, this disease could not have been studied in this manner 
without violating the common sentiment of regard for the dying 
and the dead, the medical men who pursue such investigations 
upon the food-animals, may justly claim that by such studies as 
these they confer a three-fold benefit upon mankind; for in addi- 
tion to the protection of humar foods and myriads of valuable 
eattle, a correct and controlling knowledge of human pestilences 
is promoted, as it could be in no other way. 
4) The demonstration of the same law of ground incubation, 
or development of a contagium deposited upon the soil from the bo 
wels. This very important law or truth concerning certain infective 
principles or substances was first demonstrated by Prof. Petten- 
kofer of Munich; and the demonstration, as the Metropolitan 
Board of Health very well knows, related to the propagating prin- 
ciple of the Asiatic cholera. Dr. Wm. Budd and Dr. Snow, in 
England, practically tought this doctrine, without full demonstra- 
tions, at the same time that Pettenkofer was tracing out the 
complete evidence upon which this law is now founded. As in 
regard to the infective cause of cholera, so in regard to the Te- 
xas Cattle Disease, the bowels of the living, and in some instan- 
ces apparently healthy, individual carrier of the pestilential germs, 
may evacuate — with excrement, these germs so completely develo- 
ped that they may at once begin the fatal and incubative work 
of infecting other individuals; or, on the other hand, the germ 
development in such excrement may be so incomplete or imma- 
ture („unripe,“ as Prof. Hallier says of the anaerophytic spores), 
that the surface of the soil, or the herpage on which the excre- 
ment is dropped, must serve as the nursery and „hot-bed“ for nou- 
rishing them into the advanced or infective and poisonous stage 
of development (the ,,ripe“ state Prof. Hallier), before the blood 
and tissues of the exposed and healthy individuals can become 
infected. In the present state of advancing demonstrations in re- 
gard to the pestilential contagium of cholera, this would scarcely 
