514 



speedily solidifies. The crystals thus formed are the iodide of te- 

 trallylamnvonium, which, like the corresponding compound of the 

 ethyl-series, is but slightly soluble in solution of potassa. It is ob- 

 tained pure by exposing it to the air until the potassa is converted 

 into carbonate, and then recrystallizing it from absolute alcohol. 



The iodide, by treatment with oxide of silver, is immediately trans- 

 formed into the oxide. This forms an alkaline solution, which pos- 

 sesses all the properties of the oxide of tetrethylammonium. 



The iodide contains 



NI. 



On taking a retrospective glance at the results obtained in this 

 inquiry, it is obvious that propylene, a homologue of olefiant gas, is 

 susceptible of furnishing a mono-acid alcohol, which bears to it the 

 same relation that is observed between methyl-alcohol and marsh- 

 gas, or between benzoic alcohol and toluol, the analogue of marsh- 

 gas among the derivatives of the aromatic acids. The hydrocarbons 

 homologous and analogous to marsh-gas, the homologues of olefiant 

 gas, and indeed probably a very considerable number of other hydro- 

 carbons, may be regarded as starting-points for the production of 

 mono-acid alcohols and of all their derivatives. All these alcohols 

 are formed by the fixation of two equivalents of oxygen, which oxi- 

 dation, however, cannot be eifected directly, but is accomplished by 

 a series of substitution-] 



Marsh-gas. Methyl-alcohol. 



(VH 8 +0 2 =C 14 H 8 2 , 



Toluol. Benzoyl-alcohol. 



C 6 H 6 + 2 = C 6 H 6 2 , 



Propylene. Allyl-alcohol. 



But olefiaut gas and its homologues are capable of furnishing 

 mono-acid alcohols by another reaction, which has not yet been 



