e ancient
bather would not suffer the inconvenience that accrues to the bather in
the modern hot-air bath, whose head, when he is standing upright, is in
a considerably higher temperature than any other portion of his body.

The temperature of a bath should not be regulated by the firing of the
furnace. This should be regularly stoked, and kept at one uniform
heat-giving condition. Bad firing and forced firing may crack the stove
should it be of iron, and the air may be overheated. The temperature
should be regulated by means of the hit-and-miss ventilators at the
floor level. Fanlights between the various hot rooms, with screw-rod
adjustment, serve as a means for regulating their relative temperatures.

The heating power of furnaces must be studied. Having calculated the
cubical contents of the rooms to be heated, and given the heating power
of the stove or apparatus to be employed per cwt. of metal or
superficial foot of radiating surface, we arrive at the necessary size.

Messrs. Constantine give the following tables to show the heating power
of the "Convoluted" stove. The figures give the requisite size of stove
to raise the air to about the relative temperatures I have mentioned
before, and with ordinary firing.

Weight of Sq. ft. of Area capable
metal. heating surface. of heating.
--- --- ---
cwt. sq. ft. cub. ft.

14 35 500
20 55 1,200
22 69 2,000
34 119 3,500
36 139 5,000
45 180 8,000
50 231 12,000
56 296 16,000

When different kinds of heating apparatus are employed, their heating
power must be carefully ascertained and calculations entered into, or it
may be found necessary to resort to the costly and humiliating process
of dragging out the stove or pulling down the furnace and refitting a
larger one. This point is worth attention. Such mistakes are not
unfrequently made.

As regards the amount of air that should flow through the hot rooms, an
allowance of 40 cubic feet per head per minute should be the minimum, if
purity of atmosphere is to be maintained. In a bath, the importance of
perfect ventilation cannot possibly be over estimated, as not only ha