On the Glazing of Earlhm F(/pIs tvithout Lead. 203 



P. S. I liad almoft forgot to obferve, that the door and 

 Tvindows of my dear child's room were kept almoft con- 

 fiantly open, and, being exaiSlly oppofite to each other, na- 

 turally created a free circulation of frcfli air. 



OhJ'erv at'ions on th'is Cafe by Dr. Thornton. 



Mifd Corpe, a^t: eighteen when I faw her, was convulfed; 

 and the nurfe faid, " that, if it was her child, nothing more 

 *' fliould be given;" even her mother requefted, " if there 

 ** really were no hopes, that (he might not be difturbcd by 

 ** medicine." What increafed the alarm was: a tradefmaii 

 a few doors off had lately died of this fame fever under thii 

 eminent phyfician, leaving behind him a A\id()w and fix 

 children. The cafe, indeed, feemed deplorable; but deipair 

 ihouid never be allowed while there is life ; and it autho- 

 rifed the exhibition of the vital air, which undoubtedly con- 

 tributed much to the recovery of this. amiable young lady. 



XVII. On the Glazing of Earthen Veffds iv'uhoiit Lead*. 



x\S it is well known that the common glazing by lead 

 employed for earthen ware is of a pernicious nature and pre- 

 judicial to the health, H. Niefeman, a potter at Leipfic, has 

 propofed the following: — ^I'ake nitre, pot-afli, and common 

 fait, of each half a pound, with double that quantity of pul- 

 verifed glafs, and mix them well together; then take a well 

 baked flat earthen di(h, cover it pretty thick with well beat 

 clay, ftrcw over the clay as much fand as will adhere to it, 

 and fufter it to dry. Put the above ingredients, well mixed, 

 into this difli, and introduce it into the furnace in order that 

 they may be all fufed together. The difli, however, muft be 

 placed within another, in order that the ingredients may not 

 be loft in cafe the dilh fliould happen to crack : but if it be 

 well covered with clay carefully beftrcwed with fand, little 

 <langer is to be apprehended. When the ingredients hav^ 



* From Niue Summlioi^ cekommifchcr Sxhiijicn. 



been 



