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 oft 
the particular work for a short time, until the poisonous 
effect which manifested itself by eruptions on the face had 
disappeared. 
