588 EVENING DISCOURSES 
Experiment IX.—Illustration of spontaneous ignition by means of pyrophoric 
iron. 
Models.—Sheathed explosives. 
Films— 
Film (1).—Showing a demonstration of a coal dust explosion at the 
Research Station, Buxton. 
Film (2).—Showing shot firing with 
(a) Clay stemming. 
(b) Clay and sand stemming. 
Slides— 
(a) Showing total casualties in coal mines. 
(6) Showing total fatal casualties. 
(c) Showing effect of stone dusting on casualties due to explosions. 
