extinguisher that will do more with the same amount of chemicals used
than any patented fire extinguisher in the world. A small demijohn is
filled with a substance that looks like water, but sells for the price
of brandy. Half a dozen of these demijohns scattered about a building
will protect it from conflagration, for it contains a liquid which is
the most inimical to fire that is known. A gallon of it thrown on the
flames will subdue any ordinary fire, and yet--here is the secret--it is
nothing but aqua-ammonia.
_Section 19. Money in the Laboratory._