388 , MisceUaneous InteUigeiice. 



East Indies by Mr. Babington. It occurs massive ; its colour is 

 snow white, with the exception of a few small dots and stripes 

 of ochre-yellow; its fracture is small conchoidal, passing into 

 uneven; it gives sparks with steel, is not easily scraped by 

 a knife, but is not hard enough to scratch fluor spar; its frag- 

 ments are sharp-edged. Internally it has no lustre ; it is very 

 slightly transparent, and that only at the edges. Its specific 

 gravity is 2.5615 ; its locality is not known. 



It dissolves in acids slowly when cold, even though powdered; 

 but heat quickens the solution, and its accompanying effer- 

 vescence. When analyzed, 100 grains gave 



Magnesia ..... 46 

 Carbonic acid . . . . 51 

 Insoluble matter . . . 1.5 



"Water 0.5 



Loss ...... 1. 



so that it is nearly a pure carbonate of raagmesia. 



Dr. Henry, at the conclusion of this analysis, expresses his 

 doubts of the existence of a true bi-carbonate of magnesia. 

 They are founded on the analysis of a salt prepared by himself, 

 by mixing dilute solution of sulphate of magnesia with a solu- 

 tion of carbonate of soda, charged with carbonic acid ; they 

 consisted of 29 base, S'O acid, and 41 water. — Aiinals of Philo- 

 sophy, i. p. 254. 



6. On Compounds of Sulphur with Cyanogen, &c. — M. Ber- 

 zelius, in pursuance of his researches on the compounds of 

 cyanogen, (p. 208,) has lately examined the sulphuretted com- 

 po-unds of cyanogen, and added much to our knowledge of 

 them. He concludes that the substance, as prepared by M. 

 Grotthus or M. Vogel, (i. e., by fusing sulphur with ferro prus- 

 siate of potassa, dissolving, filtering, and drying,) is a sulpho- 

 cyanuret of potassium; and though he has not been able to 

 separate the sulpho-cyanogen or sulphuret of cyanogen from 

 the base, so as to have it in a separate state, yet he deduces its 

 composition from experiments, as being 1 atom cyanogen, 

 and 2 atoms of sulphur, or 



Carbon 20.63 2 atoms 150.66 



Azote 24.28 1 atom 177.26 



Sulphur 55.09 2 atoms 402.32 



100. 730.24 



The sulpho-cyanuret of potassium is composed of 



Potassium 40.15 1 atom . . . 979.83 

 Azote 14.53 2 atoms 354.52 ) 



Carbon 12.35 4 atoms 301.32 > 1460.48 



Sulphur 32.97 4 atoms 804.64 3 



100. . 2440.31 



