1865.] of the Series C n H 2n+2 . 169 



100 was left behind. As soon as such a residue ceased to be observed, the 

 distillates were collected at intervals of 3, and thus at last by far the largest 

 quantity was found to boil constantly between 90-92. Whilst, however, 

 the boiling-point was lowered, no change in the specific gravity was observed. 

 The hydride of heptyl boiling at 90-92 has the specific gravity 07148 at 

 15, whilst that boiling at 98 gave the specific gravity 07149 at 15-5. 

 In the analysis and determination of the vapour-density of the hydrocarbon 

 boiling at 90-92, Mr. Wright obtained the following data : 



(1) 0*2047 substance gave 0*631 carbonic acid and 0'2935 water. 



(2) 0-2114 substance gave 0*6515 carbonic acid and 0-3030 water. 



Found. 



Calculated. T~ Ilf* 



C 7 84 84-08 84-05 



H 16 16 15-93 15-93 



100 100-01 99-98 



(1) Balloon with air 6-8/55 



Temperature of air 10 



Balloon with vapour 7'0135 



Temperature on sealing 162 



Residual air 0'2 cub. centim. 



Capacity of balloon 88*9 cub. centim. 



(2) Balloon with air 8-3717 



Temperature of air 11 



Balloon with vapour 8*5661 



Temperature on sealing 152 



Capacity of balloon 1 19'3 cub. centim. 



Residual air 



Vapour-density Found. 



calculated for ,. * N 



C 7 H 16 . I. II. 



3-46 3*45 3-46 



If a current of chlorine is passed into these hydrocarbons in diffused 

 daylight, the gas is completely absorbed for some time, and the liquid 

 assumes a yellow colour ; however, suddenly it becomes heated, torrents of 

 hydrochloric acid are evolved, and the colour of the chlorine disappears, 

 and from this point the chlorine acts quietly, and hydrochloric acid is con- 

 tinuously evolved. If a little iodine has been added, the action continues 

 in the dark, but higher chlorinated products are more easily formed. If 

 100-200 grammes of the hydrocarbon have been employed, the current of 

 chlorine must be interrupted after some hours, and the liquid treated with 

 solid caustic potash to remove the absorbed hydrochloric acid. The non- 

 attacked hydrocarbon is then separated by distillation from the chlori- 

 nated product, and the former treated repeatedly with chlorine, until all 



