162 On some new Products [1825. 



as the quantity of oxygen which has combined with the hydro- 

 gen to form water, and which with the 0*34- of vapour nearly 

 make the diminution of 0*9. 



It will be seen at once that the oxygen required for the car- 

 bon is four times that for the hydrogen ; and that the whole 

 statement is but little different from the following theoretical 

 one, deduced partly from the former experiments : 1 volume 

 of vapour requires 7*5 volumes of oxygen for its combustion ; 

 6 of the latter combine with carbon to form 6 of carbonic acid, 

 and the 1*5 remaining combine with hydrogen to form water. 

 The hydrogen present therefore in this compound is equivalent 

 to 3 volumes, though condensed into one volume in union with 

 the carbon ; and of the latter elements there are present six 

 proportionals, or 36 by weight. A volume therefore of the 

 substance in vapour contains 



Carbon .... 6x6=36 



Hydrogen . . . . 1 x3= 3 



39 



and its weight or specific gravity will be 39, hydrogen being 1. 

 Other experiments of the same kind gave results according 

 with these. 



Among the liquid products obtained from the original fluid 

 was one which, procured as before mentioned, by submitting 

 to the portion distilling over at 180 or 190, Corresponded 

 with the substance already described, as to boiling-points, but 

 differed from it in remaining fluid at low temperatures ; and I 

 was desirous of comparing the two together. I had no means 

 of separating this body from the bicarburet of hydrogen, of 

 which it would of course be a saturated solution at 0. Its 

 boiling-point was very constantly 186. In its general cha- 

 racters of solubility, combustibility, action of potassium, &c., 

 it agreed with the substance already described. Its specific 

 gravity was 0*86 at 60. When raised in vapour, 1*11 grain of 

 it gave 1*573 cubic inch of vapour at 212, equal to 1*212 cubic 

 inch at 60. Hence 100 cubic inches would weigh about 91*6 

 grains, and its specific gravity would be 43*25 nearly. In 

 another experiment, 1*72 grain gave 2*4 cubic inches at 212, 

 equal to 1*849 cubic inch at 60; from which the weight of 100 



