OP ARTS AND SCIENCES. 31 



as described below, on one occasion it dissolved it without decomposi- 

 tion, and this solution gave on cooling thick needles, which gave the 

 following results on analysis. 



0.0903 grin, of the substance gave 0.0176 grm. of silicic dioxide and 

 0.0506 grm. of sodic fluoride. 



Calculated for 



Found. 



9.10 



25.38 



On addition of water the substance analyzed was decomposed with 

 deposition of silicic acid. We have not succeeded, however, in re- 

 peating this experiment, as in all other cases the product from the 

 action of hot alcohol has been chinoline fluosilicate, which crystallizes 

 in long thick needles, as the solution cools, and gives a clear solution 

 with water. Its composition was determined by the following anal- 

 yses of the substance purified by two crystallizations. 



I. 0.1244 grm. of the substance gave 0.0200 grm. of silicic dioxide. 

 II. 0.2054 grm. of the substance gave 0.0325 grm. of silicic dioxide 

 and 0.1254 sfrm. of sodic fluoride. 



The trichinoline disilicotetrafluoride resembles the corresponding 

 aniline compound closely in its properties. 



Didhnethylamine Silicotetrafluor ide, ((CH 3 ) 2 NH) 4 (SiF 4 ) 2 - — When 

 dry dimethylamine (prepared according to Baeyer and Caro) was 

 mixed with fluoride of silicon, a white powder was deposited, which 

 w r as analyzed in the crude state, since it could not be purified because 

 of its very slight stability. 



0.2320 grm. of the substance gave 0.0740 grm. of silicic dioxide 

 and 0.2038 srrm. of sodic fluoride. 



ted for 



Found. 



14.89 

 39.75 



Properties. — A white solid, which like the corresponding compound 

 of aniline is very unstable, decomposing spontaneously at ordinary 



