52 



E. DIVERS AND T. UAUA. 



verv nearly ugreeing with those got by Kaschig. lîut while he has 

 given t«) the salt only one molecule of water to KeNsS^Oj^, we find 

 that there is one molecule to K3NS2O7. Neither he nor we hajj})en to 

 have succeeded in getting, the salt quite free from excess of alkali : 

 we say ' happen,' because we are sure that we could prepare it so. 

 Tabulatin o- his and our analyses wdiicli siiow least excess of alkali with 

 calculations for his formula, and for ours — 



A Hit schiff. Divers and Haga. 



Calc. li'ouud. Calc. Found. 



Potassium o7-09 'Mriu aß-OO 36-29 



Sulphur 2()-2o U)-33 19-67 19-42 



Wuter 2-85 — 5-53 5-61 



^ve see Hiat liis analysis is less incompa(;i))le witli our formula than 



with his, for whir'h his sulphin- is much, and inexplicably, tcjo low, 

 while agreeino- with his otlier and all our determinations of sulphur. 

 We estimated the water in our preparation, and it will be seen that 

 potassium, sidphur, and water all agree well with our formula. Our 

 analysis w^as made on a precipitate got by adding alcohol to a, solution 

 of dipotassium salt and potassium hydroxide in about the calculated 

 proportions. 



We now tabulate tlie other analyses by Raschig and by us along 

 with a calculation for Iv3NS„U7,7hKOH,7,H,() wMiich matches Kasdiig's 

 preparation : — 



Ü llasclriff. Divert and Harja. 



Calc. («) 0>) 



Potassium o7-5o 37-55 37-4(S 37-o7 



Sulphur 19-66 19-56 19-23 19-54 



Water 4-15 — 3-86 — 



Our (d) preparation was got by using excess of concentrated 



