THE HYPHOMYCETES 173 



Gilbert Brooke states that M. Audouini and T. endo- 

 thrix are rare in the tropics, and thinks that dhobie 

 (washerman's) itch is caused by Tinea, ectothrix. The 

 p. access of X-ray treatment lies not in any power to destroy 

 the ringworm spores, but in a copious defluvium of hairs 

 from the part exposed, leaving a follicle free from disease. 

 Germicides are recommended as an accompanying treat- 

 ment. 



Strickler and Kolmer (Journal Amer. Med. Assoc., 

 July 17, 1915) found that on injection into the superficial 

 layer of the skin of the arm of children suffering from this 

 disease of 0-05 c.c. of a suspension of dead ringworm 

 fungus in salt solution, usually there occurs a local re- 

 action. These authors recommend a vaccine. 



Microsporon Furfu:. 



This organism, which is found in pityriasis versicolor, 

 probably belongs to the same family as the T. tonsurans. 

 It occurs as masses of short threads and clusters of oval 

 refractile spores in the scales of the skin, but has not yet 

 been artificially cultivated. 



Achorion Schonleinii. 



The yellow cup-shaped crusted masses of fungus in 

 favus are caused by A. Schonleinii. The disease affects 

 man, dogs, cats, caged rabbits, mice, and rats. In the 

 last two cases it is commonly fatal. In the fowl lesions 

 occur mostly on the comb and wattles as a grey crust 

 (' white comb '). Favus can be transmitted from animals 

 to man. A. Schonleinii in the earlier stages is indistin- 

 guishable from the T. tonsurans, but soon assumes the 

 honeycomb appearance. It grows on all ordinary media 

 except milk. Gelatin is liquefied. On agar the colonies 

 appear distinctly in forty-eight hours. They are sur- 

 rounded by a fine fringe of threads. On blood-serum 

 star-shaped colonies are formed, which radiate out from 

 the centre, producing a flower-like appearance. The 

 medium is not liquefied. It also grows well on bread and 

 potato. 



