PARIS GREENS. 



17 



into solution in much less time than this, and consequently is not acted 

 upon as well by the lime to form the less harmful compound calcium 

 arsenite. 



ANALYSES AND DISCUSSION. 



Table II, following, gives the composition of forty-five samples of 



Paris Green: 



TABLE II. Composition of Paris greens. 



((See correspondence with manufacturers, page 61. 



On examining the analyses in Table II, it will at once be seen that 

 neither the amount of moisture nor sand is in any case sufficient to be 

 objectionable. 



As to sodium sulphate, which is always present in samples of Paris 

 Green on account of the method of manufacture, there is no reason 

 why a sample which had been at all well washed should have more 

 than 1 per cent present. The table shows that 16 of the samples of 

 Paris (liven have between 1 and 2 per cent, '2 have between 2 and 3 

 1301 No, 6802 2 



