188 VEGETABLE PAKASITES. 



when solution of sugar was added or poured over them, when mil- 

 dew rapidly grew over the Achorion, just as other mould-spores ger- 

 minate speedily on apples and in sugar. When muscle or brain 

 were immersed in water putrefaction was seen to set in, and infu- 

 soria were forming, but the action Was stopped on addition of solu- 

 tion of sugar, and conferva and mildew were then observed to grow. 



No infection resulted from the scabs of favi in case of fresh 

 wounds, or small pimples scratched open ; the scabs crumbled to 

 pieces. Fuchs asserted that favus was more easily transferred 

 on the uninjured skin. Remak attached, in May, 1842, small scabs 

 of favi on the skin of his arm by means of sticking plaster; the 

 scabs dried up and shrank, and fell off after a few days without 

 leaving a trace of their existence. He washed his arm, and 

 took a bath ; but after the lapse of a fortnight he felt itching at 

 the place of inoculation. He noticed a dark-red spot, covered 

 with epidermal scales, the skin being thick and hardened. From 

 the centre of the red spot there grew a pustule, and the remain- 

 ing scab frequently secreted purulent matter. After three weeks 

 from the first appearance of the spot, Remak removed the puru- 

 lent scab, together with the pus, and found below a whitish 

 body sunk cup-like into the corium, and consisting of nothing 

 but favus-fungi, which formed a real favus-scab after a week. In 

 another week a drop of pus began to make its way from under- 

 *neath it, then ceased again, in order to drop again at times, and 

 after four weeks the dry favus-scab fell off, measuring 4"' in 

 diameter, and the skin became covered with epidermis. 



Contribution to the history of the favus. Schoenlein was the 

 first to discover the vegetable nature of the favi, and to make a 

 drawing of the filaments of the mycelium and the granulated 

 stroma. Remak had noticed mouldy filaments in 1837, but did 

 not pay any further attention to them. He made the first 

 attempts towards inoculation, believing the fungus was only 

 able to live on a cachectic soil, and opposing the view of 

 Henle, who thought that the fungus was accidental. Fuchs, 

 Jahn, and Langenbeck discovered the fungus, but viewed it as 

 an attribute of scrofulous rashes, more especially of exanthemata 

 and serpiginous crusts. Gruby first described accurately the fila- 

 ments and spores, as well as their penetrating the bulbs of the 

 hairs : he inoculated the fungus successfully even on wood, and 

 all his statements have been confirmed by Bennett, the latter 

 believing, however, a scrofulous state to be indispensable. Hannover 



