4'2 Sketch oj the latest Improvonents [Jan. 



Phosphate of lime 2'500 



Phosphate of magnesia 0*500 



Phosphate of iron 0*007 



Phosphate of soda 0*400 



Muriate of potash 0*700 



Lactate of soda 0*300 



4*407 



Such is as concise a sketch as I have been able to draw up of the 

 improvements which chemistry has undergone of late years, chiefly 

 in those countries with which we have had the least intercourse. I 

 have omitted some important facts altogether, because 1 intend to 

 insert translations of the papers containing them in the succeeding 

 numbers of the Annals of Philosophy , as speedily as 1 can find 

 room for them. 



II. MiNERAJLOGY. 



This branch of science is divided into two parts ; namely, 

 Orj'ctognosy and Geognosy. It will be convenient to take each 

 separately. 



I. Oryctognosy. 



Under this head I include the description and analysis of 

 minerals. 



1 . Native Carlonate of MagTiesia. — The carbonate of magnesia 

 from India, of which I gave an account in the Annals of Philo- 

 sophy, iv. 155, deserves to be mentioned, because it agrees nearly 

 in its composition with the conite of the Germans, though it differs 

 irom it in its external characters. It is composed of 



Carbonate of magnesia 72 



Carbonate of lime 28 



100 



This does not differ much from a compound of two integrant par- 

 ticles of carbonate of magnesia and one integrant particle of car- 

 bonate of lime. 



2. The mineral called haiiyne is hitherto scarcely known in 

 Britain. It is an inhabitant of volcanic rocks ; and has hitherto 

 been found only in Italy, Auvergne, and at Andernach. According 

 ^oGmelin, {Annals of Philosophy, iv. 193,) its constituents are. 



Silica 35-48 



Alumina 18*87 



Sulphate of lime 21*73 



Lime 2*66 



Oxide of iron I'lG 



Potash 15*45 



Water 1*20 



Sulphureted hydrogen and loss 3*45 



100*00 



