1865.] of the Series C tt H 2rt+2 . 469 



added, therefore, a sufficient quantity of pure amyl to raise the boiling 

 point, but even the sodium in the fused state acts very slowly, a consider- 

 able quantity of gaseous products being evolved. 



After the mixture had been heated for a week, large quantities of the 

 iodides were still present, and after destroying these by strong nitric acid, 

 the remaining hydrocarbon was found to be pure amyl. 



No better results were obtained by adding anhydrous ether to tho 

 mixture. The action in the cold is exceedingly slow ; heated in sealed 

 tubes, the iodides are soon decomposed ; but besides gaseous products, 

 only amylj and not a trace of a mixed radical, is formed. 



Besides hydride of heptyl, other products are formed by the action of 

 caustic baryta upon azelaic acid. Of those only one could be obtained in 

 a pure state. If the aromatic liquid which is first obtained is distilled 

 with water, hydride of heptyl chiefly distils, and a brown oily liquid re- 

 mains behind, which, after cooling, solidifies to a crystalline mass con- 

 taining a brown aromatic oil which may be removed from the crystals by 

 pressing between blotting-paper. The solid substance is repeatedly re- 

 crystallized from hot diluted alcohol, in which the still adhering oil is very 

 slightly soluble. The pure substance is thus obtained in small colourless 

 needles, which are grouped in tufts. It is odourless and tasteless, very 

 soluble in ether and in alcohol, insoluble in water, melts between 41 and 

 42, solidifies again at 40, and distils between 283-285 (not corrected) 

 without decomposition. 



The following analysis shows that it has the formula C H2. 



0-2480 substance gave 0*7800 carbonic acid and 0-3215 water. 

 Calculated. Found. 



C 85-7 85-77 ' 



H 2)l 14-3 14-40 



100-0 100-17 



The quantity obtained was not sufficient to determine the vapour-density. 



If this olefine is suspended in water and bromine added, not in excess, 

 the two substances combine readily to a colourless oily liquid, the odour of 

 which resembles bibromide of ethylene. It cannot be distilled without 

 decomposition, and appears even to be decomposed by a diluted solution of 

 caustic soda, as a small portion thus treated in order to remove an excess 

 of bromine changed its odour completely. By an unfortunate accident 

 the whole of the bromide was lost, -with the exception of the portion treated 

 with caustic soda. This was washed with water, dissolved in ether, and 

 the ethereal solution dried with chloride of calcium. After evaporating 

 the ether and drying the remaining small quantity of heavy yellow oil 

 over sulphuric acid under the air-pump, only just sufficient was left to 

 determine the bromine. 



0-1500 gave 0-0736 of bromide of silver, and 0*0102 of metallic silver, 

 corresponding to 25*8 per cent, of bromine. 



From the boiling point of the olefine it appears that its molecular for- 



