i68 OBSERVATIONS ON A FEW CASES OF PORRIGO. 
know of four well-authenticated cases of this, two of which 
came under my own observation—one in 1868 and the other 
in 1869. This is perhaps easily accounted for by considering 
P. scutulata as merely an “ accidental variety ” of P. favosa 
(vide Mr. Fleming^ remarks in the Veterinarian for Oc¬ 
tober last). Both the instances referred to occurred on 
cattlemen: in the one case the favi appeared on the back 
of the right hand, and in the other on the upper lip, in 
the moustache. 
The favi on the back of the hand were confined to a spot 
rather larger than a shilling piece; flattish, pustular-look¬ 
ing, elevations of the epidermis existed, with a good deal of 
surrounding inflammation. In three or four days these 
favi apparently burst, and the discharge from them gradu¬ 
ally formed one large scab or crust, of a dark, nearly 
transparent yellow colour, completely covering the spot 
where the favi or so-called pustules had been. This almost 
circular yellow-crusted spot was treated with some simple 
caustic, and afterwards well washed with warm water and 
soap. A day or two subsequently the yellow crust fell off, 
leaving a delicately dark and glistening cuticle below. The 
disease was now supposed to be checked; not so, however, 
for in a short time a new cluster of favi , precisely like the 
first, made their appearance. Happening to make a visit 
to the farm at this juncture, the cattleman again showed 
me his hand, and I rubbed the circular spot with a smart 
application of Ung. Hydrarg. Bin . Iod., which had the 
desired effect. 
In the other case, where the affection attacked the upper 
lip, the patient presented a most ludicrous appearance. At 
the time I saw him the superincumbent transparent yellow 
crust (or, rather, series of crusts) covered the whole upper 
lip, and was fully one third of an inch deep. The disease 
commenced in this case also with the usual clusters of flat 
pustular-looking favi, which, passing through the ordinary 
course, and spreading, finally presented the appearance men¬ 
tioned. I believe the cure in this case was extremely tardy, 
partly owing to the ulcerated state of the underlying cuticle 
and partly from repeated recurrences of the disease. 
The subjects of both these attacks undoubtedly received 
the contagious materiel while engaged dressing the cattle 
affected with P. scutulata. 
The latter form of Porrigo is, as already mentioned, very 
common amongst cattle. It is easily distinguished from P. 
favosa by the light grey colour of its attendant scabs or 
crusts, by the small size of its introductory achores or pus- 
