226 ON POULTRY LOUSINESS IN THE HORSE. 
Her owner informed us, in answer to our inquiries, that she 
stood in a stall under an open pigeon-house. He was recom- 
mended to have the mare clipped, and then brought back again 
to the College for treatment. 
The hair being clipped from the upper parts of her body, 
discovered to view a great number of circular patches, some 
solitary others confluent, and all perfectly hairless, covered 
with epidermic scales, giving them a greyish aspect. In some 
places the bare spots present in their centres little adherent 
crusts, which by scratching become detached, and leave ex- 
posed underneath little superficial rose-tinted sores, issuing an 
inclined-to sanguinolent serosity ; and, in addition, there is to 
be perceived in the substance of the skin little papulae still co- 
vered with hair, whose epidermic coverings are readily detached 
with the finger-nail, and come off, dragging the hair along with 
them, leaving a bare, bloody, circular spot. 
These different lesions were apparent upon the head and 
neck, the back, the sides, the breast, the flank, towards the fold 
of the groin, and the croup and dock. Everywhere there is 
burning itching, and whenever any body touches the skin, the 
animal leans that way, and by the curling of his upper lip 
manifests the pleasure he experiences in being scratched. 
It was clear enough this was a case of phthyriasis, arising 
from cohabitation with pigeons. 
’ Third Observation. 
An entire horse was admitted on the 23d July, 1850. For 
two months he has been a martyr to an insupportable itching, 
causing him to bite and rub himself wherever he could. His 
stable is all day long occupied by fowls lodging in the neigh- 
bourhood. 
Although possessing every external mark of health, his head 
and neck are covered with cracked red incrustations, concealing 
excoriations in a state of suppuration, &c. &c. Even in the 
parts covered with horse-hair, such as the mane, tail, &c., the 
hair is moist from an abundant issue of serosity, as though the 
skin underneath were the seat of vesication. 
In this case the disease had existed for two months. Never- 
theless, in comparing some of the lesions not as yet disfigured, 
from being in situations little likely to be rubbed, with the 
impressions still in our mind, we had great reason to attribute 
the present disease to the cohabitation of the fowls. 
Fourth Observation. 
The disease produced by the stabling of the horse being under- 
neath a poulterer’s shop. 
