634 EXPERIMENTS MADE ON SHEEP WITH THE INSECT, &C. 
a sort of shining surface ; it was tolerably adherent to the hide, 
here and there cracked, and in the cracks were seen the insects in 
their nests. It is peculiar that we, after the 6th day, found fewer 
insects than before that time. To-day the sheep were washed 
with Walz’s wash. — On the 47th, the 22d of November, the 
wash was repeated, and by that means the scab was completely 
cured in both sheep. 
Experiment No. 3. 
Inoculation with a single Tnsect. — (Sheep No. 3.) On the 7th 
of October, about noon, one of the insects was taken from a scabby 
sheep, which was known to be a female by its eight well-deve- 
loped feet, and gave evidence of its being pregnant by its thick, 
almost round body : this was carefully placed upon the skin of the 
back of the sheep, which has been above marked No. 3. The 
little animal lay quiet for some time, so that we could not see when 
it bored into the skin. The wool was pressed together over the 
spot, and was marked strongly with ink, that it might more easily 
again be found. — 2d day : The insect could not be found in the 
spot, nor was there any appearance of change in the hide there or 
around. — 3d day : To-day there is neither insect to be found, nor 
any appearance of disease of the skin. — From the 4th to the 6th 
day, the same. — 7th day : On this day, a little elevated spot, 
about the size of the head of a pin, appears at the spot, which is 
moderately hard, but without a change of colour, and not appa- 
rently hotter nor more irritable than the rest of the skin. — On the 
8th and 9th days, the little elevation observed yesterday is covered 
in the middle by a very small yellow scurf, which is firmly fixed 
upon the skin. Around it the skin is somewhat redder, not 
inflamed, but harder than the rest of the skin. — 10th and 11th 
days : The little scurf is gone, and in its place the skin is of a yel- 
lowish dirty colour, rough and moist. — On the 12th day, the same, 
but a new scurf is formed. — 13th day : The scurf seen yesterday 
is larger and firmer than the former, and the skin around is harder, 
redder, and more inflamed than before. When slightly rubbed 
with the finger, the sheep was pleased, and, when it is more 
strongly rubbed, it wags its lips. — 14th day : The same appear- 
ances were remarked as yesterday ; the yellowish scurf had a 
darker appearance, almost brown, and at different joints appeared 
to be coming loose. When it was raised by a pair of pincers, five 
little insects made their appearance, which moved themselves in a 
lively way in the midst of the moisture which surrounded them, 
and then crept out in different directions : the large or old insect 
was not to be found. — 15th day : A new and thicker scurf has 
