198 Messrs. Thorpe and Young on the Combined Action 



after repeated distillation over sodium, until the metal was no longer 

 attacked; it boiled constantly at 166-168°. 

 It was analyzed as under : — 



0-2090 grm. hydride gave 0*6460 grm. carbon dioxide and 0-2950 

 grm. water. 



Calculated. Found. 



C 10 84-45 84-30 



H 22 15-55 15-69 



100-00 99-99 



Its specific gravity was 0*7394 at 13°-5, compared with water at the 

 same temperature. Schorlemmer's amyl (decatyl hydride), obtained by the 

 action of sodium on amyl iodide, boiled at 158-159°, and had the specific 

 gravity 0-7275 at 14°. It is very probable that this hydrocarbon is not 

 the normal hydride, but stands to the decatyl hydride boiling at 168° in 

 the same relation that the amyl hydride boiling at 30° does to the isomer 

 boiling at 39°, or as the ethyl amyl boiling at 90° (sp. gr. 0-6819 at 18°-5) 

 does to the normal heptane boiling at 99° (sp. gr. 0*6915 at 18°). The 

 normal decatyl hydride obtained by Pelouze and Cahours from petroleum 

 had the specific gravity 0*735 at 15°; the hydride found by Greville 

 AVilliams in the oil from boghead coal had the specific gravity 0*7365 

 at 18°. 



A determination of the vapour-density of the decatyl hydride from 

 paraffin gave the following data : — 



Balloon with air 13*9745 grms. 



Temperature of air 12° 



Balloon with vapour . . . . , 14*2215 grms. 



Temperature on sealing 222° 



Residual air 0*2 cub. centims. 



Capacity of balloon 105-5 cub. centims. 



Vapour-density calculated 



for C 10 H 22 (H=1). Found. 

 71 72-8 



10. The next fraction of the liquid boiling below 200° distilled constantly 

 between 192° and 197°, the greater portion of the liquid coming over 

 at about 193-195°. The fraction boiling at 193-195° was treated with 

 bromine, with the folio whig results : — 



(1) 7'63 grms. required 4*76 grms. bromine. 



(2) 7-18 „ 4-09 



Mean. .7-405 4-425 



The fraction boiling at 195-197° was also treated. 



7'04 grms. hydrocarbon required 3*85 grms. bromine. 



Assuming that the fractions are mixtures of undecane and undecylene, 



