oat as we carry them about.— 1 85. In what two ways does water act in pot-
ting out fires ? Explain other means of putting out fires.— 186. How can
a fire be made under water ?— 187. What is said about fire extinguishers ?
Explain the extinguishing of a fii-e in a Scotch coal-mine. — 188. What is the
oxyhydrogen blow-pipe ? What is its use ?— 189. What is the Drummond
Light? What the oxycalcium light? When are they used ?— 190. Ex-
plain the cause of explosions. What causes the noise ?— 191. Describe the
hydrogen pistol, and tbfi experiment with soap-bubbles ?— 192. What is
spontaneous combustion? State and exphiin the experiment with phos-
phorus and charcoal. Give various examples of spontaneous combustion.
—193. Is oxygen indispensable to combustion ?— 194. What are the requi-
sites for ordinary combustion ? Give examples illustrating the variation of
these in different cases.— 195. What is said of ordinary oxidation ?— 196.
What of sun-bleaching? — 197. How is animal heat the result of combus-
tion? — 198. What facts show that animal heat is not made in the lungs?
Where is it made ?— 199. What is the temperature of the body ? What is
said about the body's giving out heat ? — 200. What is the fuel of the fire in
the body? What is said of the sources of the fuel? What of the uses
sometimes made of the fat of the body ?— 201 .What of the amount of the
fuel used?— 202. How is the windpipe the smoke-pipe of the body?— 203.
