EXPERIMENTS MADE ON SHEEP WITH THE INSECT, &C. Ill 
Experiment No. 7. 
Communication of the Infection without Inoculation. — (Sheep 
No. 8). — On the 14th of October, in the forenoon, the sheep 
marked No. 8 was brought into the same stall in which were 
kept the three scabby sheep, that it might become spontane- 
ously infected, and for the purpose of seeing how soon after 
being with the diseased sheep the first symptoms would dis- 
tinctly shew themselves. On the 2d day, neither in the general 
condition of the sheep nor in any part of its body was there 
evidence of the disease. — From the 3d to the 9th day the sheep 
was still apparently quite free. — On the 10th and 11th days 
the insects were found on the skin of the back in several spots, 
and of different sizes, but there were no blotches of the skin, 
nor any other change of it apparent. — On the 12th day the in- 
sects appeared in several places on the outside upon the skin, 
and the skin itself, in three different places, about the size of a 
grain of linseed, was of a yellow reddish colour, and somewhat 
thickened, but not inflamed. — On the 13th day, the same as 
yesterday. — On the 14th day the spots on the skin appeared 
changed, and moister than the sound skin. On the 15th day 
things were the same, but now scabs began to shew themselves. 
On the 16th day the scabs increase in circumference, and when 
the scabby places are scratched the sheep wags its lips; in 
other places, where the skin is of a bluish colour, little knots 
are felt, and in all such places insects are found. — From the 
17th to the 26th day, the scabs increase in hardness and size, 
and the insects in number. — From the 27th to the 32d day. 
The scab now occupies the greater part of the back, especially 
in the neighbourhood of the shoulder-blades and at the beginning 
of the neck. — On the 23d day, as there now could be no doubt 
of absolute infection, the sheep was treated with Walz’s wash, 
and which was well rubbed in for the first time. — Eight days 
later the wash was repeated, by which the cure, in most of the 
places was accomplished ; but, as appeared afterwards, the animal 
was not wholly cured ; and from the spots which were uncured 
the disease spread, so that at the end of January 1828, the 
disease had nearly covered the whole body. Probably this 
would not have happened if the wash had been used the third 
time, which Walz directs to be done on the 16th day. 
Experiment No. 8 ( repetition of the former Experiment.) 
(Sheep No. 4). 
On the 14th October, with the same object in view, this sheep 
was exposed to the spontaneous contagion by being brought 
into the same stall with a scabby sheep. — On the 2d day nothing 
