[■-22S ] . 

 XXXVl. Inttlligeme and Miscellaneout Articles. 



n.ATINUM. 



1 HE largest piece of this metal aver met with, weighs one pound 

 and a half. It was found by a Negro slave in the gold mines of 

 Condoto, in the government of Choco, and is now lodged in the 

 Royal Museum in Madrid. 



TEST FOR BARYTKS AND STRONTIA. 



Make a solution of the eartli, whichever it may be, either in 

 nitric, muriatic, or some other acid which will form a soluble 

 salt with it: add sohition of sulphate of soda in excess; filter, 

 and then test the clear fluid by subcarbonate of potash. If any 

 precipitate falls down, the earth was strontia ; if the fluid re- 

 main clear, it was barytes. — {Journal of Science and the Arts, 

 x.JSii.) 



SKLENIUM. 



The proprietors of the Sulphuric-Acid Works at Gripsholm, in 

 Sweden, having had occasion to repair the leaden chamber of 

 their manufactory, collected a few pounds weight of a substance 

 chiefly consisting of sulphur impregnated with Selenium, which 

 Professor Berzelius, of Stockholm, has forwarded to London, to 

 the care of William Allen and Co. Plough-court, Lombard-street, 

 requesting that it might be sold for the benefit of the proprietors 

 of the Gripsholm Works, at a price which they have fixed. By 

 application, as above, it may be had in bottles of the following 

 sizes, together with a translation of the process recommended 

 by Professor Berzelius for procuring this new substance : 



^ s. d. 

 2 -ounce phials, price .. 5 



4-ounce .. 9 6 



8-ounce • • . . 16 6 



16-ounce .. 1 10 



DyEING. 



We announced some time ago that M. Braconnot, of Nancy, 

 had discovered means for applying orpiment to stuffs of all kinds, 

 and laid his process before our readers, M. L. Lassaigne has 

 since succeeded in fixing chromate of lead with the fibre of all 

 kinds of stuffs, by following a process similar to that employed 

 by M. Raymond, to fix Prussian blue upon silk. The following 

 is the process described by M. Lassaigne. 



The well cleansed skeins of fiilk are immersed for a quarter of 

 an hour in a weak solution of subacetate of lead at the common 

 temperature ; the%;^ are then taken out and rinsed thoroughly in 

 a large (juantity of water. This combines the silk with a cer- 

 tain 



