132 THE WONDERFUL HOUSE THAT JACK HAS 



these commonly used vehicles. A device like the 

 one below is good in cold weather to help in ven- 

 tilating a room. The board holding up the lower 

 sash allows air to come in between the sashes in 

 such a way that injurious draughts 

 will not be caused. One of the 

 very best helps in securing good 

 ventilation is a fireplace. The 

 fire heats the air in the chimney, 

 causing it to rise. The air of 

 the room naturally crowds in to 

 take its place, and so, if there is 

 sufficient chance for pure air to get 

 into the room, the atmosphere 

 Ventilating in cold weather, may be kept in excellent condi- 



keeping the lower sash of ti f breathing> 

 a window raised by a 



board. Of course, at the best, indoor air 



is a poor substitute for the free air outside. For this 

 reason, every one should be out-of-doors as much as 

 possible, earnestly aiming to become hardened to 

 wind and weather. How many people in waiting 

 for a car or train stay in a crowded station, breath- 

 ing air fairly reeking with waste particles of tissue 

 and microbes, just because the outdoor air is a little 

 cold. Walking up and down while taking in deep 

 breaths of the frosty air would give the glow of 

 natural warmth, together with a healthful toning up 

 of the nervous system. These, no doubt, would be 

 followed by keener relish of the evening meal and 



