14 



Mr. PocHiN and Mr. Hunt remarked that the effects of 

 breathing the vapour of arsenious acid produced in the 

 smelting of ores were not so injurious as might be expected ; 

 occasionally, however, the workmen had to be taken off 

 the particular work for a short time, until the poisonous 

 effect which manifested itself by eruptions on the face had 

 disappeared. 



