JRlNCIPLfiS OF «tTtriItfRIC ACID. 531 



The nnlinrnecl sulpliiir was fdtirid to weigh 48 grains and 

 lialf; consequently 15 If were converted into sulphuric acid. 

 The product diluted in a certain quantity of water was min- 

 gled with mnriate of barytcs, till no more precipitate was 

 produced. The sulphate of barytes, well wiiifhed and dried, 

 weighed 1109 grains; but, calcined in a platina crucible, its 

 weight was reduced to 1082 grains. 



To 'find the proportions of the constituent principles of 

 concrete sulphuric acid, Mr. Klaproth took a hundred 

 grains of highly concentrated sulphuric acid,, the -specific 

 gravity of which was 1*85: this he diluted with fifteen parts 

 of water, and added to it muriate of barytes, till no more 

 precipitate was formed. The sulphate of barytcs, carefully 

 washed and dried, weighed 225 grains. Hence it follows: I'loportions of 

 1st, that 100 parts of sulphuric acid of the specific gravity Sd'.Sru* 

 of 1*85 are composed of ric acid : 



Concrete sulphuric acid 74*4 or, sulphur 31*5 

 Water - - 25-6 oxigen 42-9 



water 25-6 



100 



2dly, That 100 parts of concrete acid are formed of sul- of concrete 

 phur 42-3, oxigen bl'l, ''^^^ '■ 



3dly, That 100 parts of calcined sulphate of barytes and of sulphate 

 contain barytes ^7^^ sulphur 14, oxigen 19. ^^ barytes. 



SCIENTIFIC NEJVS, S(c, 



A Clasmjication of Ves^etahlef^^ and Plan of a new Method 



formed on that of Tournefort, according to which the 



Plants of the Garden of the private School of Pharmacy/ 



ut Paris are arranged: bi/ D. L. Gu yart, Assistant 



Professor of Botany at the School, Sfc. •» 



If, among the different botanical methods, that of Tour- Tournefort's 

 nefort has always been considered as the most easy, and best*^'^'*^^*^^*^^°^^^ 

 calculated to guide the first steps of those who would study 

 plants; it must also be confessed, that it is insufficiertt, 

 when we endeavour to obtain an accurate idea of vegetable 

 organization. For this reason, no doubt, the methods of 

 Linneus and Juspieu are at present preferred, and almost 

 jfinivarsally adopted by botanists. 



It 



