Oleic acid in glycerine, 236.
Orsman on roburite, 142.
Oxonite, 152.
Oxy-cellulose, 102.
Packing gun-cotton, 78. dynamite, 116.
Page's regulator, 260.
Panclastite, 152.
Percentage composition of nitro-glycerine, 18.
Perkin on magnetic rotation of nitro-glycerine, 19.
Phenol, tri-nitro-phenol, 152.