62 
two volumes of vapour. It has, therefore, the same density 
as camphor, and like it may be considered as consisting of 
1 volume of vapour of oil of turpentine, = 4,7643 
3 volume of vapour of oxygen, = 0,55135 
1 volume of vapour of dumasine, = Loo 
Professor Kane read some passages of a letter from 
M. Dumas, of which the following is an extract: 
«* * * * ‘The researches, of which you have given me 
an account,* promise the happiest results for science, I 
cannot too much encourage you to complete them; you will 
see by the journals that [ have communicated your letter to 
the Academy of Sciences, where it met with the most honour- 
able reception. Allow me to add, that M. Peligot and my- 
self had obtained the carbo-hydrogen, c, H,, as well by sul- 
phuric acid as by anhydrous phosphoric acid. We had 
found, that potassium gave the product c,4,0, which you 
have obtained in another manner, but we were stopped by 
the composition of the sulpho-mesitylate of baryta, of which 
you have given the explanation. These researches have 
been made some time, but other matters caused us to neglect 
them, and I do not now regret it, since they are in such 
good hands. * * * *” 
«‘% * * * T announced yesterday to the Academy the 
existence of the carbo-vinate of potash, which is 
KO Co, + C,H,0 + C0,, 
I also obtained, conjointly with M. Peligot, the carbo-methy- 
late of baryta, which is 
Ba. oco, +c, H, 0 + CO’. 
In these bodies the acid changes very readily into carbonic 
* On pyroacetic spirit. See Proceedings, pp. 42 and 58. 
