EXPERIMENTS MADE ON SHEEP WITH THE INSECT, &C. 637 
applied. — 3d day, Nov. 4th : The inoculated spots are somewhat 
harder than the sound skin; they are also red, and on the surface 
there is a thin soft scurf of a yellowish colour. The punctures are 
still covered with the bloody scab, but are without any further 
change. The parts on the other side from which the wool was re- 
moved are red, warm, and somewhat tense, and in part covered 
with a yellowish scurf. — 4th day, Nov. 5th : The colour of the 
skin on the flank where the matter was applied in the three punc- 
tures is changed in colour from red to yellow. The heat is scarcely 
above natural, and the irritation not at all increased : by rubbing 
the part there appears to be no effect produced upon the animal. 
The yellow scurf in most of the places and the bloody scab on the 
little wounds are the same as yesterday. The spots to which the 
matter was not applied have the same appearance as yesterday, 
except the scurf is somewhat thicker and firmer. — 5th day, No- 
vember 6th : In all the spots the appearances are the same as 
yesterday. — 6th to 9th day, from 7th to 10th November : The 
same, excepting that on the spot of the shoulder-blade, where the 
matter had been applied, there is a little swelling of the size of a 
millet-seed, which is somewhat hard, of a yellowish-red colour, 
and very irritable : in the surrounding part the skin is somewhat 
harder, irritable, and of a bluish-gray colour. 10th day : The 
inoculated spot on the shoulder the same as yesterday. The punc- 
tures on the flank are healed and the scabs are fallen off. The 
knots and the change of colour in the skin are no more to be seen. 
The places from which the wool had been removed are covered 
with a thin yellow scurf, but shew no further change. — 11th day, 
November 12th : Appearances the same as yesterday. — 12th day : 
The knot in the shoulder-blade appears to-day with a little yel- 
lowish-brown scurf on the top, and there is more redness around 
it, and very irritable : the sheep rubs himself with his mouth and 
his foot in this spot, and when the man scratches it the animal 
wags his lip. In the other spot to which the matter has been ap- 
plied there is no change, nor is there any change in the spot from 
which the wool was taken. — 13th day : In the spot on the shoulder 
there are now to be seen surrounding the little knot several insects 
of different sizes, and lively. The skin itself is as yesterday. 
The spot on the hinder part is quite sound. The two places from 
which the wool was simply removed are still covered with scurf, 
but without irritation. — 14th to 16th day, 15th to 17th November : 
The spot on the fore part shews more and more the symptoms of 
the scab, and the insects daily increase. The spot behind is now 
quite healthy ; on the other two spots the wool is now growing 
afresh, by which the yellow scurf is loosened from the skin, which 
appears quite healthy underneath. — 17th to 29th day : The scab 
VOL. xxiii. 4 Q 
