Miscellaneous Intelligence. 289 
cesses of conversion and purification, which appear at first sight of ‘very 
trifling nature, exert most important influences upon the composition an 
purity of the product. Gun-cotton of quite exceptional character bas 
been discovered, in several instances, among samples received from Hir- 
tenberg and among the first supplies obtained from Stowmarket; other 
exceptional products have also been produced by purposely modifying, in 
several ways, the system of manufacture as pursued at Waltham Abbey. 
@ very considerable difference exhibited between some of these and 
fi 
ascertaining whether results recently arrived at in France apply to gun- 
cotton as manufactured in this country. 
_ The principal points which have been established By the results ar- 
ows : 
(1.) Gun-cotton produced from properly purified cotton, according to 
directions given by von Lenk, may be exposed to diffused daylight, 
Manufacture now adopted. 
(3.) If gun-cotton in closed vessels is left for protracted periods exposed 
to strong daylight or sunlight in a damp or moist condition, it 1s affected 
toa somewhat greater extent; but even under these circumstances the 
roduced in the gun-cotton by several months’ exposure Is of a 
ange p 
ny ane nature. Gog : 
_(4.) Gun-cotton which is exposed to sunlight until a faint acid reaction 
has become developed, and is then immediately afterward packed into 
boxes which are tightly closed, does not undergo any change during su 
quent storage for long periods. (The present experience on this head 
rd sl = 
_ \®-) Gun-cotton prepared and purilie 
tem, and stored in ied tes condition, does not furnish any indi- 
Cation of alteration, beyond the development, shortly after it is first 
Packed, of a slight liar odor and the power of gradually imparting 
