31't Intelligence and Miscella?ieous Articles. 



a very sweet smell ; solidifies at about 20° Fahr. ; its taste very 

 sweet. 



7th. Iodine and Carburefted Hydrogen, Hydriodide of carbon of 

 Faraday (iodide of carburetted hydrogen). This is solid, crystalline ^of 

 an aromatic odour and sweet taste. 



The composition of the iodides of carbon is given as follows: — 

 Proiiodide. Periodide. 



Iodine 1 atom -99528 Iodine 3 atoms 2-98584 



Carbon 1 -00462 Carbon 2 "00924 



Annales de Chim. et de Phys. xxxix. 225. 



PREPARATION OF PIPERINE. 



The following is M. Vogel's process and result : — Sixteen ounces 

 of coarsely powdered black pepper was digested in double its weight 

 of water for two days, five times in succession, and the residue 

 strongly pressed and dried. It was then digested for three days in 24 

 ounces of hot alcohol ; the fluid pressed out, filtered, distilled and 

 ultimately evaporated to a syrup. The impure crystals of piperine 

 deposited on cooling, were washed witli ether, to remove resin, then 

 dissolved in three times their weight of hot alcohol, sixty grains of 

 animal charcoal added, the liquid filtered and evaporated sponta- 

 neously, when 110 grains of pale yellow crystals of piperine were ob- 

 tained. On repeating this process with the residue of the maceration, 

 seventy grains more were obtained. 



According to other experiments, it appears that the green acrid 

 resin in the pepper, which in the above process was dissolved by the 

 ether, is the active and febrifuge principle in pepper, rather than 

 the insipid piperine. — Brande's Archives, vol. iv. p. 221. — Quarterly 

 Journal, June 1829. 



ANALYSIS OF ARSENIATE OF IRON. 

 M. Boussingault has analysed the arseniate of iron, which occui-s 

 in a vein of auriferous hydrate of iron, in decomposed porphyritic 

 grunstein at Loaysa near Marmato, in the province of Popayan. 

 The results are as follows : — 



Arsenic acid 45-8 Or freed from the gangue. 



Peroxide of iron 31-7 Arsenic acid 



Oxide of lead 00-4 Oxide of iron 



Water 15-6 lead 



Alumina 02-6 Water 



Silica 05-0 



Oxide of copper (traces) 101'2 



101-1 

 The increase of weight probably arises from the peroxidation of a 

 part of the iron. — Annales de Chim. et de Phys. xli. p. 75. 



SUGAR FROM STARCH. 

 M, Weinrich says, that from one to two parts of sulphuric acid 



for 



