XXv1. The Fermentation of Cacao 
the engine on such a comparatively heavy fuel 
and of « overcoming the effects of the excess of 
carbon, After several years of. steady applica- 
tion a practical kerosene carburettor is said to 
have been evolved, in which 70 per cent. kero- 
sene to 30 per cent. gasolene is used, the fuels 
being mixed in the same tank and readily 
vaporising upon entering the combustion 
chamber of the motor. Another method 
which is said to have found approval is the 
use of a vaporizer to heat kerosene to a point 
where it volatilizes and then mixing the vapour 
with air. — 
At the same time the advocates of denatured 
alcohol are exploiting its advantages as a 
motor fuel with new zeal, as the market is 
believed to be nearing a level’to bring it 
into more practical competition with “the 
petroleum product. While alcohol meets the 
general fuel requirements, it cannot be adapted 
to the prevailing type of motors, but with 
motors designed especially for its use, greater 
efficiency and almost 30 per cent. increased 
power are claimed for alcohol over gasoline. 
On a sufficiently extensive scale, fuel alcohol 
may be produced about one-third cheaper than 
gasoline on its present basis, but this realization 
presupposes its adaptability to the automobile 
engine. Its service in this field has already 
been established as an inexpensive carbon 
remover ; the larger use of lower grade g gasoline 
has magnified engine troubles. by increased 
