On definite Proportions. S75 



with ihejn. Mr. Biukr, Weyuiuuth-place, ITacknev, who 

 had fixeti llitm in sixtetn rooms. Mr. Clicrry, who had 

 fixed ihem iu tight rooms, near Ciickfieid, in Sussex. 

 The general tenor of the above certificates bhovvs that they 

 have fuimd these chinuiev-pieccs to answer the same pur- 

 pose as those made of Poriland-siune, and provided at half 

 the expense. 



XLV. An Attempt to determine the definite and simple Pro^ 

 portions, in which the ainsthiient Parts ofiiimrgajilc Sub- 

 stances are milled ivitk each other. By .Iacob Berze- 

 Lius, Pr(Jessor of Median e and Pharmacy, and M.R.A* 

 Stockholm. 



[Continued from page 205] 



IX. Muriate op Lead. 



1 .) £ IVE grammes of yellow oxide of lead were dissolved 

 in muriatic acid in a glass llask ; the product dried and 

 melted in the flask, was 6 187 gr. ot muriate of lead. 



2.) i'en gr. of the yellow ox.de aflortied in a similar ex- 

 periment ia'30: during the tusioii, a little horn lead flew 

 off with a visiljle vapour, the smell of which was not acid, 

 but like that which is afforded hy liquid metallic salts. 

 Hence it follows that the muriate of lead confcists of 81 or 

 80 82 of oxide and 1 9 or ig- 1 8 of acid. 



3.) Five gr. of muriate o, lead, fused in a red heat, were 

 dissolved in water impregnated with a little nitric acid, and 

 precipitated by nil rate of silver. Tne precipita'e, vvhea 

 fused, weighed 5'li gr. ; and this gives 19-13 of acid in 

 100 of the nmnate of lead. 



4.) The cx|)CTiment was repeated, and afforded 5*09 of 

 muriate of silver; whence we liave 19-04 of acid. 



According to these experiments, the muriate ot lead con- 

 sists of Muriatic acid ig-lS 100-0 

 Oxide of lead 80-82 4-21-4 



If we cJileulate from the component parts of the sulphate 

 of baryta, the Milphate of the protox.dt ot lead, and the 

 muriate of baryta, we have 19+ : 280=i;8S : 4 l(j B. The 

 calculation differs by 3*2 fron\ the experiment; and al- 

 though [ have frequently repeated the piocesses, I have not 

 been able to detect the source of the error. If, according 

 to one ot the experimoiils, we t2ke lyi for the barvta by 

 which |(K) parts of sulphuric acid art* aaiurated, we still 

 have only 4 1'? of oxide ol Kadto idO of muriatic acid. 

 The oxidt, which saturates loo parts of muriatic acid, con- 

 S2 tain;. 



