Notices respecting New Books. 385 



the sulphuret but the sulphat of lead, which was perfectly neu- 

 tral, and weighed 126.5 parts. The respective changes that 

 took place therefore, supposing the base of this salt to be the 

 yellow oxyd, are as follows : 



Oxviien. 



Lead . . . 86.51 with 6.748 produce 93.258 oxyd of lead 

 Sulphur 13.49 with 19.752 produce 33.242 sulphuric acid 



^oftd^^ I 100.00 26.500 1 26.5 sulphat of lead. 



"Two things are to be particularly noticed here : 



'' One of them is : that the sulphur of the sulphuret of lead 

 was exactly sufficient, when converted to sulphuric acid, to sa- 

 turate the lead of the same sulphuret when converted to the suh- 

 oxyd of lead. 



" The other thing to be noticed is : that the quantity of the 

 sulphur in the sulphuret was almost exactly double the quantity 

 of oxygen taken up by the lead of the sulphuret, being as 13.49 

 to 6.748. 



" From the former of these facts the author infers as a ge- 

 neral rule, that a metal combines with sulphur in such a propor- 

 tion, that when the sulphur is converted to sulphuric acid, and 

 the metal to an oxvd, the sole product will be a neutral sul- 

 phated oxyd of the same metal. 



*' From the latter of these two facts the author infers, that in 

 every neutral sulphat the oxvgen of tlie base equals half the 

 v\'eight of the sulphur of the acid with which it is saturated. 



" The composition of sulphuric acid is inferred from the above 

 oxydation of sulphuret of lead, to be in the proportion of 13.49 

 of sulphur to 19.752 of oxygen, the whole addition of oxygen 

 to the sulphuret being 26.5, and 6.748 of this being estimated 

 as the portion belonging to the oxyd of lead. 



" Sulphuric acid therefore consists of 



Sulphur ... .40.58 — 100.000 

 Oxygen .... 59.42 — 146.426 



100.00 246.426 



*^ According to the second of the two propositions just men- 

 tioned, 100 parts of sulphuric acid therefore will saturate so 

 much of any oxydated base as contains iS^^s — 20*29 of oxy- 

 gen. 



" As an exact determination of the elements of sulphuric acid 

 is of great importance in analysis, the author proceeds to com- 

 pare the above-mentioned result with those produced by other 

 modes of operating. 



" Both BuchoU and Klaproth have sought to fix the elements 

 Vol. 40. No. 211. Nov. 1815. B b of 



