168 On some new Products [1825. 



them over oxide of copper, in hopes of results which might 

 assist in suggesting correct views of their nature. They all 

 appeared to be binary compounds of carbon and hydrogen, 

 and the following Table exhibits the proportions obtained; 

 the first column expressing the boiling temperature at which 

 the products were distilled, as before mentioned ; the second 

 the hydrogen, made a constant quantity ; and the third the 

 carbon. 



140 . . 7-58 



150 

 160 

 176 

 190 

 200 

 210 

 220 



8-38 

 7-90 

 8-25 

 8-76 

 9-17 

 8-91 

 8-46 



These substances generally possess the properties before 

 described, as belonging to the bicarburet of hydrogen. They 

 all resist the action of alkali, even that which requires a tem- 

 perature above 250 for its ebullition ; and in that point are 

 strongly distinguished from the oils from which they are pro- 

 duced. Sulphuric acid acts upon them instantly with pheno- 

 mena already briefly referred to. 



Dr. Henry, whilst detailing the results of his numerous and 

 exact experiments in papers laid before the Royal Society, 

 mentions in that read February .22, 1821 *, the discovery made 

 by Mr. Dalton, of a vapour in oil-gas of greater specific 

 gravity than olefiant gas, requiring much more oxygen for its 

 combustion, but yet condensable by chlorine. Mr. Dalton 

 appears to consider all that was condensable by chlorine as a 

 new and constant compound of carbon and hydrogen; but 

 Dr. Henry, who had observed that the proportion of oxygen 

 required for its combustion varied from 4*5 to 5 volumes, and 

 the quantity of carbonic acid produced, from 2*5 to 3 volumes, 

 was inclined to consider it as a mixture of the vapour of a 

 highly volatile oil with the olefiant and other combustible 

 gases : and he further mentions, that naphtha in contact with 



* Phil. Trans, for 1821, p. 136. 



