46 
Hogg, on Parasitic Fungi. 
the liair whicli is imbedded in the skin, and whose spores 
are never produced above the surface of the skin. A sanious- 
looking matter is discharged from the pustules, which under 
the microscope consists of scrofulous pus-corpuscles and irre- 
gular blood-discs, having many more of the white blood-cells 
than in the blood of health. The hairs were examined in six 
cases of Mentagra, all were broken or bent and covered by 
fungoid growths. The roots of the hairs were closely invested 
with spores and filaments, sprouting longitudinally outwards 
and upwards. Both the filaments and spores are described 
as larger than those of the Microsporon furfur, and are said 
to form a sort of vegetable sheath to the hair below the skin 
only. This latter description is graphic and true; but I 
should hesitate to admit that the mere size of a vegetation 
can entitle it to be considered a separate species ; for it may 
depend on the age, the growth, or on some peculiarity of the 
soil, just as the Poly podium filix-mas, or common male fern, 
may appear in a dry, barren soil, as a delicate plant, and yet, 
in a damp and shaded situation, with a congenial soil, it may 
assume the appearance of a gigantic shrub several feet in 
height. Moreover, the hair, as well as the follicles and root, 
was found, in several instances, with tufts of fungi growing 
on the surface. 
Psoriasis {Scaly disease). 
Psoriasis and Lepra are two names for one and the same 
disease, the former being used by authors when the scaly 
patches are irregularly difi'used, and the other term applied 
when the patches are isolated and circumscribed, with ele- 
vated edges, denoting a more active though less extensive 
form of disease. 
Case 1. — Cobweb-like appearances of mycelia and fila- 
ments. Epithelial cells treated with Liq. Potassse exhibit a 
reticulated character. 
Case 8. — Psoriasis guttata. Mycelia with filaments in a 
fine hair-like state, separated and running wider over a mass 
of epithelium scales. 
Case 9. — Nearly cured when examined. Mycelia fila- 
ments loose, and scattered sporules; epithelial scales with 
granular matter (fig. 7) . 
Case 10. — Scales, sporules, and a few filaments. 
Case 11. — Psoriasis guttata. Mycelia filaments and nu- 
merous scattered sporangise. 
Case 12. — Mycelia and filaments branched. 
C«5e 13. — Epithelial scales and filaments. • 
