RIXGWOEM. 789 



cryptogam, the Piicinia favi ; this latter is somewhat different 

 from the tricoph3'ton in the mode in which its cell-elements 

 are made up and joined together. 



Besides the variation in form and colour of the crust, honey- 

 comb differs from ordinary ringworm in that in the former, 

 when fully developed and of any extent, we recognise a gener- 

 ally constant and peculiar smell, which has been variously 

 likened to that given off by bruised hemlock, or to the presence 

 of mice or cat's urine. That the fungi which it would appear 

 produce this as well as the tonsurant form are one and the 

 same, only varying as to their manifestations from peculiarities 

 of soil, the natural consequence of differences in textural 

 elements in the different species in which these are met with, 

 seems to me rather doubtful, rendering the explanation of 

 certain phenomena Ave observe rather difficult, and not as yet 

 undoubtedly demonstrated. 



My own experience as respects this feature of identity of 

 fungi and varying development of symptoms according to the 

 species on which it may be imptlanted, does not corroborate 

 that of some other observers. 



I have repeatedly observed the propagation of the common 

 ringworm of cattle and horses, particularly the former, which 

 is characterized by the presence of the well-known grey 

 crusts, to both adult and juvenile human subjects, and in 

 no instance did the characteristic cup-shaped yellow crusts 

 of favus appear ; this, I know, is contrary to what such good 

 observers as Williams and MacGillivray state as having 

 occurred under their observation in the transmission of the 

 common ringworm from animals to men. 



6. Causation. — This, both as to the immediately acting- 

 agency and the favouring or providing of a suitable habitat for 

 the reception of the originating parasite, is much similar to 

 such as have been indicated as operating in the preceding- 

 variety. Certainly, it will not appear without the implantation 

 of the spores of the fungus, but is probably favoured as to 

 readiness of infection and rapidity of growth by both indwell- 

 ing and external operating agencies. 



Symptoms. — These are at first indifferent, not diagnostic 

 until some progress has been made in the hold upon the skin. 

 The only cases which have come under my notice in the horse 



