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trufted to glazed earthen-ware with perfed fafety, 

 fince vegetable acids a6t more forcibly on the calces 

 of lead than on the metal itfelf; hence the feverc 

 colicks often brought on in time of harveft among 

 the poor labourers, from drinking cyder after (land- 

 ing but a few hours in glazed pitchers.f 



Yet glazed earthen-ware, in a variety of forms, 

 conftitutes the veflels in which pickles are kept j 

 in which acid fruits are preferved; and in which va- 

 rious kinds of tarts are baked. It is moreover cu- 

 rious to obferve, that a marked preference is given 

 to them by moft frugal houfewives, who find by ex- 

 perience that fuch veflels occafion a material faving 

 in the article of fugar : — but they remain to be told, 

 that the increafed fweetnefs proceeds from the acid 

 of the fruit being blunted by its union with the 

 glazing of the veflel, which has a more pernicious 

 tendency than they feem to be aware of. For cer- 

 tainly thefe good ladies would not defignedly 

 fweeten our viands with fugar of lead ! 



Here it ought to be remarked, that there is a 

 material difference in the mode of glazing veflels. 

 The glazing q{ ftone ware and china, being a vitri- 

 fication of the clay, is indiflbluble in acids, therc- 



t London Medical Inquiries, vol. y. p. 404* 



B b 2 fore 



