644 



THE FATE OF ARSENIC IN THE BODY, 



or (b) that arsenite which has ostensibly dried upon the scurf 

 and hair continues to be absorbed in minute amount by the skin. 

 Further work would be required to elucidate this point. 



It may also be added that arsenic can be detected in the 

 faeces of dipped cattle. 



Arsenic Retained in the Skin and Hair of Dipped 



Animals. 



In the report already quoted (/. c, 3), data are also given 

 for the amount of arsenic fixed in the hides of dipped animals. 

 On general physiological grounds these figures also appeared to 

 us as much too high, and since what we regard as unjustifiable 

 conclusions have been drawn from them by Cooper & Laws* in 

 an article on the " Theor}^ and Practice of Dipping," three 

 analyses of our own may be oft'ered for comparison. Table 4: 



The differences between the earlier figures and our own data 

 are very striking. For the shaved hide, or skin proper, the 

 former are from 40 to 70 times as high as the latter — from 137 

 to 251 milligrams per square foot as against about 4 milligrams. 

 The only difference between the treatment of the animals was 

 that our cattle were dipped in plain aqueous arsenite of soda 



* W. F. Cooper and H. E. Laws : " Some Observations on the Theory 

 and Practice of Dipping." Parasitology, 8, [2] (1915). 



