KAOLIN IlN" WISCONSIN". 



29 



ash, and sodaj to the silica and alumina together, and with the dec- 

 rease of the proportion of the alumina to the silica. Of the fluxes 

 the alkalies are the most, the alkaline earths the least harmful. 



Table I. — Wisconsin IcaoJins. 



(Analysed by E. T. Sweet, M. S.) 



