464 Royal Society :— 
distilling the ozonized liquid, a violent reaction takes place between — 
the ozone and the hydrocarbon. All the unaltered hydrocarbon distils 
away, and the contents of the retort suddenly solidify to a pure, 
white, amorphous mass, yielding the annexed result on combustion :— 
Experiment. Calculation. 
—__-_s*—————--_ Eres Ce 
Carbon. °.ay73'5 C260 78°95 
Piydroseny 077 Bp 8 10°52 
Oxysen i. 10" O 8 10°53 
76 100°00 
This directly-formed oxide of a hydrocarbon is unique, as regards 
both its formula and mode of production. 
Caoutchine. 
Himly’s analysis was correct. The mean results of three analyses 
are compared in the following Table with those of M. Himly :— 
Mean. Himly. Calculation. 
—— at 
Carbon’) >> S381 88°44 Ce 120 88°2 
Hydrogen . 11:9 11°56 He! AS 11°8 
136 100°0 
Two of the determinations, the results of which are incorporated 
in the above mean, were made on a substance from gutta percha. 
The vapour-density was :— 
Experiment. Himly. Calculation = 4 vols. 
4°65 4°46 4°6986 
We now for the first time see the relation between the two hydro- 
carbons. Itis the same as between amylene and paramylene. The 
author discusses the boiling-point of these bodies, and shows that 
they form most decided exceptions to Kopp’s empirical law. 
Action of Bromine on Caoutchine and its isomer Turpentine. 
Caoutchine and turpentine act on bromine in precisely the same 
manner. One equivalent of the hydrocarbon decolorizes four equi- 
valents of bromine. To determine this point quantitatively, eight 
experiments were made, four with turpentine and four with caout- 
chine. The quantity of bromine-water employed was 20 cub. cents. 
=0'2527 gramme bromine. 
Mean of four turpentine experiments. Mean of four caoutchine experiments. 
0°1074 grm. 0°1091 grm. 
Conversion of Turpentine and Caoutchine into Cymole. 
By the alternate action of bromine and sodium on caoutchine or 
turpentine, two equivalents of hydrogen are removed, the final result 
being cymole, having exactly the odour hitherto considered charac- 
teristic of the hydrocarbon obtained from oil of cumin, and quite 
distinct from that of camphogene. The liquid was identified by the, 
