On the Tinning of Copper, &c. 913 



A pint is a usual dose ; but very large quantities have been 

 drunk without any fatal effects. 



Between Welbatch and Palley Common are two wells, 

 called Hauley or B.)othbv Spa. The water of both is weak ; 

 the one contains sea salt, muriatod Hint, magnesia, and 

 selenile; the other has, with these ingredients, a chaly- 

 beate. Near Sheriot C^ommon, in the neighbourhood of 

 Wenlock, is a strong chalybeate water. On Frollcy Moor, 

 near the western side of the Longmynd, is a spring that 

 contains a small proportion of selenite and of sea salt; but 

 niuriatcd liine is the principal ingredient. It shows no ap- 

 pearance of iron with the usual test. I shall conclude this 

 section with an account of Si;tton Spa, near Shrewsbun,'; 

 for the whole of which I am indebted to Dr. Evans ; and if 

 an obligation becomes lighter by being divided, I doubt .not 

 but the readers of the article will readily join in sharing its 

 ■weight. 



[To be coptinutd] 



LV. Extract from a JVork, published by Professor Proust, 

 entitled Researcties on the Tirrni/ig of Copper, on Tin 

 Vesseh, and glazed Poiterij j published at Madrid 

 1803*. 



X HE author, in the introduction, says, that the motives 

 which induced him to undertake this labour were the doubts 

 spre.id abroad, two years before-, among the public in re- 

 gard to the salubrity of tinned copper, and the accounts of 

 the disagreeable accideius arising from vessels badly glazed. 

 Government, always attentive to every thing that can tend 

 to calm the public mind, had recourse on this subject to 

 80und chemistry ; the only tribunal competent to banish 

 doubts of this kind. Two problems v/ere presented to the 

 author to he resolved : 



Lst, Is the use of zinc advantageous or not, for tinning 

 and for tin vessels ? 



2d, Can tinning, in consequence of the lead it contains, 

 and sometimes in large quantities, expose the health of the 

 public to the same dangers as glazing of a bad quality ? 



The author divides his work into mree chapters, and eacli 

 chapter into several paragraphs. 



The first part, which may be considered as historical, is 

 /divided into four paragraphs. 



Jin the first the author na.entions the project which was 



* From the Journal dt Pljjfiifjue, Friinsirc, an ij. 



presented 



