ARTHUR F. COCA 1015 



and the writer, in unpublished experiments, failed completely to induce dermatitis 

 with I per cent or 2 per cent nickel chloride, painted three times daily over a period of 

 three to four weeks, even when the skin was irritated previous to the application of 

 the nickel with a stiff handbrush. 



No one has yet attempted to identify the "urticaria" of lower animals with the 

 totally different human skin lesion of the same name; nor has fagopyrismus in cattle 

 been identified with human food idiosyncrasy. 



