investigation and analysis. —_ authors from want of time were obliged 
confine their sete o one kind of powder and to its combustion 
he the ordinary at ic Ff re. The methods employed how- 
ever will apply with ‘i ight modifications to other cases. ‘The powder 
gave on analysis 
Siete 5 i ee OS ee ee 
ae eee + ee SE 
Hyver - MUS wey oe a 
en, - aah Be i ny 
: Carbon, 4 47 gen, ee ee a ee 
<3 oes, 2 ae 
100-00 
A preliminary qualitative analysis gave the following substances as 
solid products of the combustion of the powder employed: 1. sulphate 
es potash, 2. carbonate of h, 3. hyposulphite of potash, 4, sulphid 
of potassium, 5. hydrate of potash, 6. sulphocyanid of potassium, 7. ni- 
trate of potash, 8. carbon, 9. sulphur, 10. carbonate of ammo 
sta roducts were, 1, nitrogen, 2. carbonic acid, 3. carbonic oxyd, 
4, hydrogen, 5. sulphid of hydrogen, and occasionally 6. nitric and nitrous 
oxyds. By means of a particular apparatus the authors were able to 
. prepare the solid residue of the explosion, the smoke or vapor which ae- 
je 2 i it, and the gaseous products and to analyze each separately. 
For the elaborate details of the analyses we must refer to 
memoir. The solid residue was found to contain e 
s of potash, - - - - - 5662 
pure potash, ~~ 3... 8 6 = Se 
saa of of pola, 2 a 
id of potassium, - - = - a ees 
Hy: Shecpuan Ot es oe es ee ee 
Sul id of potassium, - - - - Se 
Saltpeter, =< 4 S22 ee oe = 
Carbon, 2° Os es ee ee gr 
Sulphur, = =. = 0 7 ee 
; 100°52 
: The condensed smoke or cornea was found to contain 
te = 65°29 © 
cn marti tres ER ae 
Hyposulphit bat ween ae eee a 
Hydrate of - - - ioe - 133 sag . 
Sulghocgald of potassium, - - - - 0655 3 
Nirteut peu, - =  S eas 
$ Carbonate of qomonia; ~~. = + = «211 : 
ake 10000 
4 that the residues of the explosion of gun- ro 
powder oe cena of nee and carbonate of potash and not 
of sulphid of potassium as is erroneously assumed in books, 
‘The gaseous products of the paid es were found to 
