TR ADMISSIBILITY OF TINEA TONSURANS. 
289 
sheath, the root of the hair, as well as its shaft, were all in¬ 
vaded by the sporules of the trichophyton. One of the hairs 
placed in the microscope showed its root ensheathed in a 
mass of sporules of an average size of ’0012 inch in diameter; 
these were also seen in the interior of the hair shaft, along 
with mycelial threads. There was likewise a fair amount of 
mycelium of a very luxuriant kind around the shaft, especially 
at the upper part of the follicle, to which the air would first 
have access. The accompanying illustration (for which, with 
the second one, I am indebted to Dr. Fox) shows the fungus 
in its mycelial and sporular form invading a portion of the 
shaft of one of the hairs : A, A, A, are germinating spores. 
X 500 DIA i 
Dr. Fox learned that several horses in the stables from 
