FIG. 4.

This is made of corrugated galvanized iron with a stove inside. They claim it is cheaper than a brick shaft, but there is a constant expense to run an extra stove.

I think a draft could be created in the outgoing flue in a

would be placing the physician in his truer and nobler position, that of a guardian of the public health and the prevention of sickness rather than curing it.

As the proper ventilation of our schoolhouses is of prime importance I wish to supplement these rambling and much interrupted thoughts by a few words on the subject.

In the report of the State Board of Health for the year 1888, Vol. VII, I explained a system of heating and ventilation which has been very effective and given good satisfaction where it has been used. It was introduced into several of our village schools in 1887. The system consists briefly of a jacketed stove with an inlet duct coming from outside and opening upward through the floor under the stove.

An outgoing duct was constructed on the opposite side of the room from the stove, extending up through the top of the building, with an opening on a level with the floor. We find this arrangement equalizes the temperature of the room to a remarkable degree, as indicated by the following observations taken October 28, 1891. The temperature outside was 31 degrees F. At 10 o'clock A. M. visited our south primary school, which was in session. In this schoolroom the jacketed stove has been in use for four years. The stove was on the south side of the room near the teacher's desk. The outgoing flue was on the north side, directly opposite. Four thermometers were placed on the four sides of the room about equal distances from the corners and a little higher than the pupils desks. After remaining thirty minutes they registered

The room seemed a little cool but no one appeared to be suffering from the low temperature. The fire in the stove

was very low.

Went immediately from this school to the east primary, and at II A. M. made the same observations as at the south primary. In this room they were not using the jacketed

stove nor any special arrangement for ventilation. In other respects the stoves in the two rooms were alike. The size and seating capacity were less than in former instances. The stove and teacher's desk were also on the south side of the room. In thirty minutes after being placed in position the thermometer registered as follows:

A difference of 13 degrees in the smaller room without the improved heating and ventilating facilities and a difference of only 2 degrees with them. This arrangement furnishes an abundant supply of fresh air at any desired temperature, and at all times under control without leaving the room. It does not necessitate any material change in the appearance of the schoolroom as shown by Fig. 1.

Soon after this system of heating and ventilation was put in, the teachers remarked to me that previous to its use the windows during the cold days in winter would become thickly covered with frost, showing a high degree of humidity in the atmosphere of the room owing to the exhalations from the lungs and bodies of the pupils. After the present arrangement had been put in, the glass in the windows remained clear at all times, and the room was free from that musty schoolhouse odor which is so frequently noticed in badly ventilated houses.

In Massachusetts this system of heating and ventilating is being quite rapidly introduced, from the fact that "the present requirements of the Massachusetts state board of inspection make it imperative for school authorities to provide some proper means for heating and ventilating the buildings under their charge."

Its recommendations are the effectiveness of the system, its cheapness, and adaptability to all schoolhouses heated with a stove, and where furnaces are not practicable.

They are using quite largely what is called the Puritan Jacketed Stove, manufactured by the Barstow Stove Company.

These stoves shown in Fig. 2 " are eighteen inches in diameter and are surrounded by a jacket made of No. 24 crimped, galvanized iron thirty-six and a half inches in diameter, thus having a space of about nine inches around the stove except at the door, where a suitable recess makes tight joints. This jacket is connected by an opening 12 x 20 inches which comes from outside of the building, the inlet in lower stories being four or five feet from the ground and covered with a netting."