2253 



MISCELLANEOUS DISEASES 



treatment is generally useless. Pathologically the condition resem- 

 bles that in the first stage of the production of a cutaneous horn, 

 which, indeed, -had formed in one caseVeported by'Colcott Fox. 



Fig. 884. — ACANTHOKERATODERMIA Pr^CORNUFACIENS. 



Fig. 885. ACANTHOKERATODERMIA Pr^CORNUFACIENS. 



KERATOMA PLANTARE SULCATUM.' 



Historical and Geographical.— This disease was first described by 

 Castellani in Ceylon. It is found also in India and tropical Africa, 

 and a case has been recorded in Macedonia. 



etiology.— This is unknown, though in certain cases yaws may 

 perhaps play a role in its causation. The affection is much more 

 frequent during the rainy season, and occurs generally in natives 

 who do not wear shoes or sandals; bnt we have seen, a typical 



