1 . Salisbury, Two newly discovered skin diseases. 2 1 1 



or in living animal tissues, where planted in them; but where 

 animal tissues are kept saturated with these secretions for a 

 time and these same growths are allowed to develope in the 

 saturated tissues ; these vegetations become, — so to speak, — ani- 

 malized, — so changed in constitution, that they will thenceforth 

 grow on an animal soil ; or they have imparted to them the new 

 power of developing in the living tissues , that are not satu- 

 rated with these seci-etions. They now have become infectious, 

 and may be transplanted from one animal or human being to 

 another, having taken on the abnormal property of acting as a 

 cause of infectious parasitic disease. No doubt most, — if not all 

 of the vegetations of infectious diseases, — receive their property 

 to become parasites on abnormal soils, in this way. These vege- 

 tations are probably all perfectly innoctious and harmless, when 

 grown in their normal soils ; only becoming causes of disease, 

 »vhen the proper rules of cleanliness and other principles of 

 hygiene are neglected. 



The mucedinous and algoid growths that cause fermentation 

 in farinaceous, sacharine and some other vegetable matters, when 

 allowed to vegetate in living animal tissues, saturated with these 

 vegetable products, — also to a certain extent become animalized 

 or so changed in constitution, that they to a limited degree, — 

 and under the proper conditions, are thence forth able to deve- 

 lope on living animal tissues, — producing disease, — and may be 

 transplanted from one human being to another, — providing such 

 persons are living largely upon the vegetable products, — which 

 are the normal soil for these vegetations. Favus is a disease of 

 this kind. Skin eruptions I have often noticed in bakers and 

 millers, — which are produced by the cryptococcus Cerevisiae 

 and Puecinia. I have also occassionally found the whole body 

 of vegetable feeders completely covered with an ugly looking 

 scabby eruption produced by yeast vegetation. 



