SCIENCE AND INDUSTRY. 
is a measure of the force of the explosive, and, on a basis of comparison, 
enables the chemist to determine the relative efficiencies of the various 
compounds tested. 
Forty per cent. straight dynamite is here as elsewhere the comparison 
standard. Fifty per cent. dynamite rates 105.2, granulated T.N.T. 
113.1, 60 per cent. straight dynamite 120.2, and blasting gelatine 149.8. 
At the other end of the seale is black blasting powder 10.5, with 40 per» 
cent. gelatine dynamite 73, and the same percentage ammonia 
dynamite 75.5. 
Summing up, T.N.T. has proved itself a very tame servant; the 
beast of war has become the burden bearer of peace. For shooting up 
boulders, digging ditches, removing stumps, splitting logs, and similar 
work it is fully as tractable, every bit as safe, and entirely as efficient as 
40 per cent. straight dynamite. It gives complete detonation it pro- 
_perly handled, detonates as completely under water, and can stand 
moderate immersion in wet holes. It is less sensitive than the dynamite, 
and is therefore as safe or safer to handle. 
And this, if you please, is T.N.T. the terrible! 
Science is, I believe, nothing but trained and organized 
common sense differing from the latter only as a veteran may 
differ from a raw recruit; and its methods differ from those of 
common sense only so far as the guardsman’s cut and thrust 
differ from the manner in which a savage wields his club. 
—HUXLEY,. 
