-elating to Chemical Mass. 



243 



is 



?/=401(-8550)* + 224(-1516) A '; 



but the results are expressed in percentages of the initial value 

 of y. 



Table I. 



X. 



y, calculated. 



y, found. 



1 



60-3 



60-2 



2 



477 



477 



3 



40-2 



39-2 



4 



34-3 



33-0 



5 



29-3 



28-5 



6 



25 1 



24-5 



7 



21-4 



206 



8 



18-3 



17-8 



9 



157 



15-4 



10 



13-4 



13-3 



11 



11 5 



11-7 



12 



9-8 



10-4 



13 



8-4 



8-8 



14 



71 



72 



15 



61 



61 



Gladstone gives two variations of this experiment. 



IV. Ferric Sulphate and Potassic Snip ho cyanide (loc. cit. 

 p. 189, pi. 7. fig. 1). — On account of the weakness of the colour 

 produced wheu a sulphate is present, the amount of the salts 

 employed was doubled. One equivalent of ferric nitrate was 

 taken. The equation is 



?/ = 438 (-8208)* + 132 (-1400)"; 

 and the unit of x is 15 equivalents. 



Table II. 



X. 



y, calculated. 



y, found. 



1 



663 



65-3 



2 



52-2 



53-9 



3 



42-6 



44-2 



4 



34-9 



35-6 



5 



28-6 



28-7 



6 



23-5 



23-7 



7 



19-3 



19-6 



8 



15-8 



15-3 



9 



130 



120 



10 



10-7 



96 



11 



8-7 



81 



12 



72 



6-7 



13 



5-9 



5-6 



R2 



