47o 
Dr. Ure on the ultimate analysis of 
A still more symmetric arrangement would be derived from 
Carbon 8 atoms . . 6.0 . . . 
73-9 
Hydrogen 9 — . . 1.125 . . 
iS- 8 
Oxygen 1 . . 1.000 . . 
12.3 
8.125 
100.0 
This proportion corresponds to 8 atoms of olefiant gas and 
1 atom of water; and I think it is very possibly the true 
constitution of resin. Had the loss of weight suffered by the 
contents of the tube, during their ignition, been a few hun- 
dredth parts of a grain more, the experimental result would 
have coincided with this theoretical view. Copal 
approaches to 
Carbon 10 atoms . . 7.5 . 
80.30 
Hydrogen 7 . . 0.875 . . 
9 - 3 6 
Oxygen 1 . . 1.000 . . 
10.34 
9-375 
100.00 
Lac may be nearly represented by 
Carbon 6 atoms . . 4.5 
64.3 
Hydrogen 4 . . 0.5 . 
28.5 
Oxygen 2 — — . . 2.0 
7.2 
7 -° 
100.0 
or 2 atoms of olefiant gas -j- 1 atom carbonic oxide ; that is 
equal weights of these two binary compounds ; for 
2 atoms of olefiant gas = 2 x (0.75 -f- 0.125 ) = 1.75 
1 atom carbonic oxide . . . =1.75 
Referred to volumes, we shall have lac to consist of equal 
parts of the two gases. 
Resin of guaiac. gives 
Carbon 7 atoms . . 5.25 . . 67.7 
Hydrogen 4 . . 0.50 . . 6.5 
Oxygen 2 — . . . 2.00 . . 25.8 
7-75 
100.0 
