Manchester Memoirs, Vol. xlv. (1901), No. 15. 13 



conclusive, and do not necessarily bear the interpretation 

 placed upon^them. 



(4) That, even if Messrs. Jackson and Rich's con- 

 clusions were established for the specimens dealt with, 

 these specimens are mainly of somewhat high solubility, 

 and arguments based on them would not of necessity, and 

 do not as a fact, apply to fritts of lower solubility, since 

 these have a different chemical composition. 



(5) That, granting a very fine powder to be somewhat 

 more soluble than a very coarse one, the variations of 

 solubility of slightly-soluble glazes, between the limits of 

 fineness occurring in actual practice, are of inconsiderable 

 magnitude and of only theoretical importance. 



(6) That, whether or not the solubility varies to some 

 extent with the fineness, the matter is of no practical 

 consequence, since glazes can be obtained, and are in use, 

 which are of the fineness required in working, and which 

 conform to the suggested limit of solubility. 



