140 Miscellaneous Intelligence. 
The difference in the action of the two agents, that of the powder 
below, to compare fairly the two explosives. 
The gun-cotton was prepared with the strongest acids of commerce ; 
sulphuric, sp. gr. 1°85; nitric, sp. gr. 1:49; time of immersion about 
lutions described by Prof. Schénbein, and dyed a light straw color. 
short, it was the article of commerce, prepared by Messrs. C. & F. 
Lennig of Philadelphia, who are patentees of gun-cotton for the United 
themselves is given. en the results were better than were expected , 
from the proposed charge of powder, they were marked superior. 
When less, moderate ; and when equal, good. 
The following extract from the tables is believed to be a fair sample 
of the whole. In every instance the writer was present during the 
charging, and discharging of the blasts, and all were made at least 500 
feet below the surface. 
: Extract from Table of Experiments. 
é| ¢ Set erat Pe 
s| 2 | 2 fale 12 ELE 
ir Pa = 
S 3 Rock. 2\. “3 2. 3 . S Vitiation. 
es hee . $ Bo *s|Sals le 3 
shoe 4|2|s8|ssleslaiai 2} 4 
o| & els |2E/Seleeis|s} 2] 8 
ell i vee Rett Save fl 0 a pe 
Bs 2%: aik'a 3 lnch.|Inch. Inch. |Inch.| Oz. | 
t 
3} C. ; ge ys } 18 | 14 |paper| . . | 6 | 93) 1 |goodjnone jnone- 
ae: “ 16 | 13 | * |... 6 | 9}|1 |good|none jnone. 
5\powd. ie eet ee es ee ine 9 ie considerable. 
7 66 = 153] 13 |... | 51..]. |. |modjdense considerable. 
8 C. ep 17| 1%]. .| 8] 6 |10/14/sup. jnone 
9} C. jred ash coal, 45} 13]. .| 19} 16 1184) 24isup.|} “ 
10} C. ss 14 |paper| 12 | 10 | 94) 14) “ ge 
12| C. |white ash coal, 36 | 14 | “ | 10] 6110)1 |good| “ | “ 
13] C. . 36113 |. | 14) 6 3g igmed| * | * 
June 7, 1847. 
5. Pyroxyline, (Comptes Rendus, March 8, 1847.)—MM. FLores 
Domonte and Menarp, on submitting gun-cotton to alcoholized ether, 
obtained an incomplete solution; and on analysis the part dissolve 
gave the formula C,,H,O,+2NO,, (that of Xyloidine according to 
these authors,) and the insoluble, the formula C,,H,O,+3NQ,. ‘The 
