arm up any number of stairs inside a building, or, if fire forbids, up a
ladder outside.

5th. In saving from destruction by water what the fire has spared.
It smothers, but does not deluge; the modicum of water used to give
momentum to the gas is soon evaporated by the heat, doing little or no
damage to what is below. This feature of the engine is of incalculable
worth to housekeepers, merchants, and insurance companies.

6th. Economy. It costs only about half as much as a first class hand
engine, and about one-fourth as much as a steam engine, with their
necessary appendages, and the chemicals for each charge cost less than
two dollars.

* * * * *




HOW TO TOW A BOAT.


A correspondent of _Engineering News_ says: Those living on swift
streams, and using small boats, often have occasion to tow up stream. So
do surveyors, hunters campers, tourists, and others. One man can tow a
boat against a swift current where five could not row.

Where there are two persons, the usual method is for one to waste his
strength holding the boat off shore with a pole, while the other tows.
Where but one person, he finds towing almost impossible, and when bottom