Further Experiments on Contagious Foot-rot in Sheep. 431 
On August 25 they were all penned on a small plot of ground 
which was occupied by sheep affected by foot-rot in 1891. 
Weather. — On August 24 and 25 there were thunderstorms ; 
but the ground previously was hard and dry. 
On August 27 and 28 it rained heavily. 
On August 31 it was wet, and it rained at night. 
From August 31 to September 18 no rain, but frosty on 
September 16, 17, and 18. 
On September 20 and 21, storms. 
N.B. — Up to September 21 the pasturage was short and the 
ground practically dry. 
The sheep were kept — in the same pen which was occupied in 
1891 for a long period by sheep suffering from foot-rot — till 
November 17, on which date they were moved to a pasturage in 
which diseased sheep had been kept in 1891, and were kept there 
till January 10 following, when they were sold in perfectly healthy 
condition, not having shown any characteristic evidence of foot-rot 
during the above period. 
The observations which were made on the temperature of the 
animals are worth recording, and are given in the table on p. 430. 
The normal temperature in the animals used for the experiment may 
be taken as 103 - 5°. 
The sheep were marked thus : — 
1. O.L. single hole in left ear. 
2. O.R. „ in right ear. 
3. O.L. R. one hole in each ear. 
4. O. O.R. two holes in right ear. 
5. V.L. a nip at apex of left ear. 
6. The sixth sheep was unmarked. No mark. 
From the rise of temperature in some of the sheep at an earlier 
part of the experiment it was concluded that some infective matter 
had been taken into the system. This conclusion was sustained by 
the further evidence of heat in the feet. But instead of these 
preliminary symptoms of foot-rot becoming more marked, as they 
did in the former cases, they gradually subsided altogether. The 
experiments seem to suggest that a certain quantity of infective 
matter remained on the grass, and some of the sheep suffered slightly 
from its effects. But the quantity of active virus was insufficient 
to cause the full development of the local affection. Time is also an 
important factor ; and there is good reason to believe that an 
infected pasture becomes compax-atively harmless after some months’ 
exposure to climatic influences, especially a winter’s frost. 
G. T. Brown. 
