--------------------------------+----------------------- Description of Explosive. | Firing Point in ° C. --------------------------------+----------------------- Compressed military gun-cotton. | 186 - 201 Air-dried military gun-cotton. | 179 - 186 " " " | 186 - 189 " " " | 137 - 139 " " " | 154 - 161 Gun-cotton dried at 65° C. | 136 - 141 Air-dried collodion gun-cotton. | 186 - 191 " " " | 197 - 199 " " " | 193 - 195 Air-dried gun-cotton. | 192 - 197 " " | 194 - 199 Hydro-nitrocellulose. | 201 - 213 Nitroglycerin. | 203 - 205 Kieselghur dynamite. No. 1. | 197 - 200 Explosive gelatin. | 203 - 209 Explosive gelatin, camphorated. | 174 - 182 Mercury fulminate. | 175 - 181 Gunpowder. | 278 - 287 Hill's picric powder. | 273 - 283 " " " | 273 - 290 Forcite, No. 1. | 184 - 200 Atlas powder, 75 per cent. | 175 - 185 Emmensite, No. 1. | 167 - 184 Emmensite, No. 2. | 165 - 177 Emmensite, No. 5. | 205 - 217 --------------------------------+----------------------- _--C.E. Munroe, J. Amer. Chem. Soc._ * * * * * STATION FOR TESTING AGRICULTURAL MACHINES. The minister of agriculture has recently established a special laboratory for testing agricultural _materiel_. This establishment, which is as yet but little known, is destined to render the greatest services to manufacturers and cultivators.