IC Foreign Literature and Science, 



Almost every piece of money, French or foreign, ancJenf 

 or modern, gold, silver or copper, but especially the silver 

 coins of Italy, attracts the sideroscope with greater or less 

 activity: it is the siime with all substances, mineral, vegeta- 

 ble or animal, which contain the least atom of iron, nickel 

 or cobalt. Platina exercises a decided action, notwithstan- 

 ding all the chemical operations necessary to bring it to a 

 soft state. 



Small masses of any of the following substances, weigh- 

 ing at most, eight or ten grains, affect this delicate instru- 

 ment. All kinds of ashes, compacted by a little gum water ; 

 blood simply dried or swelled ; chocolate; bottle glass ; tour- 

 malines, green and black, not rubbed or warmed ; granite ; 

 rhomboidal quartz ; yellow topaz ; green talc ; sulphate of 

 iron ; all volcanic products ; all metals not chemically pure ; 

 brass pins, even the finest used by entomologists ; various 

 galenas and other minerals ; all aerolites ; burnt hoofs and 

 horns of cattle, &c. 



The most surprising effect of the Sideroscope is the re- 

 pulsion of the needle by bismuth and antimony. — Idem. 



22. Purity of Tin. — M. Oehngern undertook in 1822, 

 the analysis of the various kinds of tin employed in the man- 

 ufacture at Closter of sheet tin (fer-blanc) in order, to dis- 

 cover the cause of the superiority of certain kinds. He dis- 

 covered that the English grain tin, which gives the finest tin- 

 ned surface contains no foreign body. 



M. Rinman, who has rendered great service to the Closter 

 fabric, has been engaged in the examination of the saline 

 residuum obtained in the purification of common tin in order 

 to render it fit for tinning. He finds in the 100 parts, 



Tin, ..... 85.3000 



Copper, . - - - . 13.7178 



Iron and Zinc, - - - - .3300 



Arsenic, - - ... .6712 



He concludes that to the arsenic, and especially to the 

 copper, ought to be attributed the property which impure 

 tin possess of losing its lustre when used in tinning other 

 metals. — Ibid. 



23. Prussian Blue. — M. Gautier in his theoretical re- 

 searches into the formation of cyanogen has been led to the 

 following conclusions. First, calcined animal matter will 



