Scientific Intelligence. — Chcmisinj. 1 55 



may be sliired and washed ihorouglilj under water without fear of 

 detonation. The pressure even of a tube, wliich In the common 

 way so easily causes detonation, is in this case, safe. 



Iodine precipitated from its alcoholic solution by water, placed in 

 contact with liquid ammonia, gives an iodurct, whicJi, like that made 

 with iodine in powder detonates under water with the slightest fric- 



, tion. 



} It is sffd tliat no gas is disengaged in the preparation of the ioduret 



of azote; but the contrary will be evident by mixing, either tiie alco- 

 holic solution, or iodine in powder with liquid ammonia, in a tube 

 closed at one end and inverted in a capsule of water. Bubbles of 

 gas extremely fine immediately arise and increase in the upper part 

 of the tube. — Ide^n. 



\ 

 \ 



21. Chloride of nitrogen. — The method of M. SeruUas of pre- 

 paring this dangerous compound, does not differ from that usually 

 prescribed. Nevertheless, he states, tliat notable differences have 

 been observed in the products which it gives when in contact with wa- 

 ter only, or, at tlie same time with bodies which have no action on that 

 fluid. The substance having been prepai-ed with chlorine and a so- 

 lution of one part hydrochlorate of ammonia, in eighteen of water, 

 was well washed with pure water, and being exposed under water it 

 disappeared in twenty four hours. 



Caustic potash disengaged azote and formed nitrate and hydroclo- 

 rate of potash. 



Sulphurei of carlon mingled with it, slowly disengages azote, 

 forming hydrocloric and sulphuric acid and ammonia. 



Seloimm produces an explosion as violent as phosphorus. 



•Arsenic in potoder detonates as nolently with great light. 



Oxide of arsenic produces a quiet decomposition. 



JVitrate of silver acts promtly but quietly. 



Oxide of silver — a7id the oxides of copper , cobalt and lead produce 

 decomposition w^ith disengagement of azote. — Idem. 





■m 



22. The fulminating silver first obtained by Bcrthollet hy bring! 

 into contact oxide of silver and ammonia, has been regarded by some 

 chemists as an ammonturct of the oxide and by others as an uzoiuret 

 of metallic silver. 



The analogy between this compound and tlie chloride and iodide of 

 nitrogen leaves but little doubt of its being a compound of nitrogen 



