41 
HoGG_, on Parasitic Fungi. 
Case 9. — Ringworm. Hairs contorted or split up into 
fine tow-like masses, over the surfaces of which spores were 
freely distributed ; epithelial scales detached and filled with 
granular matter. 
In nine cases of Porrigo scutulata the hair was examined ; 
fungoid vegetations or vestiges of them, sometimes with spo- 
rules, sometimes without, were observable in each of these 
cases ; but in three of them they were imperfectly seen. 
It may here be observed that the filaments of the Micro- 
sporon tonsurans, said to be the cause of this disease, are de- 
scribed as found in the substance of the root s of the hair, and 
spreading longitudinally upwards; whereas, the Microsporo?i 
Audouini, the supposed source of the Porrigo decalvans, 
forms a tube round each hair outside the follicles, not in the 
substance of the hair. 
I have not been able to verify these distinctions ; on the 
contrary, on comparing many specimens of these diseases 
with each other, I have always found filaments springing up 
from the bulb, and then growing up around or along the 
hair, sometimes longitudinally in bifurcating branches nearly 
straight, sometimes in tortuous or spiral forms, with or 
without spores, as the drawings here exhibited will show. 
In both diseases the bulbs of the hairs and the hair itself 
were variously decayed and deformed. 
Pityriasis versicolor. Cloasma, furfuraceous 
Desquamation. 
Case 1. — Mr. N — . Patches about the trunk of a yel- 
lowish-brown appearance, consisting of a delicate desquama- 
tion of the epidermis. Mycelia with filaments and sporules 
growing and detached. Epithelial scales large. 
Case 2. — Microsporon furfur. As represented in drawing, 
mycilia, filaments with spores in groups and clustered (fig. 5) . 
Case 3. — Epithelial scales and filaments. 
Case 4i. — Microsporon furfur. 
Case 5. 1 j,.^ Severally showing the Microsporon 
cZl 7. J 
Case 8. — Fungoid vegetation. Epithelium deficient of 
nucleus and pale in colour. 
Case 9. — Filaments branching above the masses of scaly 
epithelium. 
Case 10. — Fungi in filaments and a few spores. 
Case 11. — Microsporon furfur. Mycelia with filaments 
