236 Scientific Intelligence. 
explosion is not very great; that produc cotton bein 
nearly twice as great, and that produced by dynamite, containing 
75 per cent of nitroglycerin, being about the same. T ective- 
great density, 4°4 
ture employed. Chloroform is produced h g ° 
uniformity in this way. Bromine acts similarly, producing from 
CH,Br, CH,Br,, CHBr, and CBr, Acetic acid treated with 2, 4, 
6 atoms of bromine in this way, gives carbon dioxide and bromr 
nated derivatives of formene. Chlorine and acetic acid gives 
ate g 
alcohol, decanted, the alcohol distilled off, and the syrup allowed 
to crystallize over sulphuric acid. n analysis, it gave the 
formula C,H,,0,; it rotates the polarized ray [a], =79°, reduce 
2304, Jan. 1881, G, F. Vi 
7. On the absorption of dark Heat rays by Gases and Va 
ise 
and 
