400 
D. E. SALMON. 
four, or six months, they are liable to contract the disease in its 
most virulent form. On the other hand, it is believed that the 
sick natives have never conveyed the disease to other suscepti 
animals either directly by contactor indirectly *™#**£% 
phere or by infecting the pastures on winch the,^ run Ha 
frequently seen sick animals in the same lots with snscep 
Jible well ones, and having injected considerable quantities of 
the blood of recently dead animals beneath the skin of snscep 
tible cattle without any transmission of the disease l P 
fectly convinced that this opinion is correct and that 
native animals are in no sense a source of the infection 
In regard to the danger of the disease being spread fro 
the dead carcase'we cannot be so certain. My investigations 
indicate that the germs of the disease exist in e sp ee 
liver and it would not be unreasonable to suppose that the 
organs carried about by dogs or other animals might m cer¬ 
tain cases be the means of infecting other pastures. We do 
not know, however, that this has’ever occurred. 
* The real danger, then, exists in the pastures or other grounds 
over which Southern cattle, whether sick or well, have travelle , 
while the sick natives are harmless. . 
The Southern cattle which convey the infection do not, as a 
rule, contract the disease, but this rule is not without exceptions. 
The germs of the disease are within their bodies, probably in their 
digestive organs, possibly, also, in the liver and spleen, and though 
when in a vigorous condition they are insusceptible to the influ¬ 
ence of these germs, when exhausted by the hardships of travel 
they frequently succumb to them. There is, consequently, a 
distinction to be drawn between the sick native animals and 
those from the South which have sickened; the former do not 
infect pastures, the latter in all probability do infect them. 
We must not expect to find these facts accepted by all who 
observe this disease, however; on the contrary, they are re- 
quently contested, and nowhere more emphatically than along the 
border line of the permanently infected district, whore the disease 
is most common, and where it is most important that they should 
be understood. The experienced sanitarian will not be surprised 
