﻿Manchester Memoirs, Vol. xlix. (1904), No. 1. 5 



could arrange for me to have samples from persons stay- 

 ing- at the Convalescent Home, near St. Annes-on-the-Sea, 

 where the air is not likely to be polluted. From this 

 institution I received five samples, four of which were free 

 from arsenic to my test, and one contained a trace equal 

 to TxVoth °f a g ram P er gallon. Photographs of these 

 mirrors are shewn in Plate /., Fig. 3. 



Through Dr. J. J. Cox, of Manchester, I obtained 

 three samples from the Northern Hospital for Children in 

 Manchester ; two were from children whose diet con- 

 sisted of bread and milk, and one from a child whose diet 

 was milk alone. The first gave an arsenic mirror equal 

 to jj^th of a grain per gallon, the second gave i^-oth, 

 and that from the child fed on milk alone was free from 

 arsenic. This seemed to shew that it was possible to get 

 urine free from arsenic in persons living near Manchester, 

 although it was the only arsenic free sample according to 

 my test which I had hitherto obtained.* See Plate /., 

 Fig. 1. 



I then arranged to get samples from persons living in 

 places in which presumably the air would contain more 

 arsenic than is usual in large. towns like Manchester. On 

 a former occasion I tested the soot from a domestic 

 chimney, and found it to contain 1*5 grains of arsenic 

 trioxide per lb., and Mr. Thomas Fairley, of Leeds, found 

 the dust on his book shelves to contain 0*4 grain per lb., 

 and in the dust from the shelves of a shop in a main 

 street in Leeds he found 0*3 grain of arsenic trioxide 

 per lb. The arsenic there found had no doubt come from 

 the burning of coal in the houses and factories in and 

 near the town. 



It occurred to me that there should be found 



*This freedom from arsenic may be due to the comparatively large 

 quantity of liquid taken, diluting any trace so much that it failed to show by 

 my test. 



