408 
D. E. SALMON. 
swaying as if they had difficulty in detaching their feet from the 
ground and regaining their equilibrium at each step they took. 
They advanced their legs half flexed, the toe of their foot drag- 
ging” (28). 
Symptoms recalling these were seen in some of the horses of 
the Deer Lodge Valley. 
In the autopsies, the congestion of the abdominal organs, and 
the general appearance of the kidneys and liver were easily 
noted ; and later the condition of the kidneys and liver was quite 
accurately determined 'by microscopic examination; but when it 
came to the nervous system we could only get a general idea from 
the presence or absence of congestion of the meninges and from 
the quantity of liquid encountered in the brain cavities. Yet, 
what a tremendous functional disturbance there might be without 
its being indicated either by congestion or transudation! It may 
be that a sufficient search through the brain, the spinal cord and 
the nervous ganglia would reveal lesions to account for the de¬ 
pression of the heart’s action and the heaviness of the movement, 
but it is evident that it would require the work of a histologist 
who had specialized on the nervous system and who could devote 
a great deal of time to the investigation. According to the 
writer’s observations, the functional depression of the heart was 
not due to fatty degeneration of the heart muscle, but to a failure 
or disturbance of the nervous influence. 
The autopsies that were made do not, therefore, reveal the 
whole story, and, so far as horses are concerned, they possibly 
leave the most damaging effects of the arsenic undiscovered. 
With cattle and sheep, the value not depending upon the freedom 
and rapidity of movement and their endurance on the road, the 
effect on the nervous system is of much less importance. 
An unusual number of hemorrhages occurring in the tissues, 
especially in those of the brain, lungs and kidneys at the time of 
slaughter, or, at least, showing as recent lesions were observed, 
indicating, no doubt, a weakening of the vascular walls. 
In the early summer, the symptoms were for the most part 
those of very chronic poisoning, but, later, as the smoke came 
