62 CHEMICAL ACTION. 



A. Because if doors and windows are 

 all made air-tight, it can get to the room 

 in no other way. 



Q. What is the best REMEDY in such a case ? 



A. The speediest remedy is to open 

 the door or window : but by far the best 

 remedy is to carry a small tube from the 

 hearth into the external air. 



Q. Why is that the BEST remedy ? 



A. Because the fire will be plenti- 

 fully supplied with air by the tube ; the 

 doors and windows may all remain air- 

 tight ; and we may enjoy a warm fireside, 

 without the inconvenience of draughts 

 and cold feet. 



Q. Why is a CHIMNEY raised so high above 

 the ROOF? 



A. If it were not so, it would smoke ; 

 as all funnels do which are too short. 



Q. What is meant by the funnel, or flue of a 

 chimney ? 



A. That part of a chimney through 

 which the smoke passes, is called the 

 funnel, or flue. 



Q. Why does a CHIMNEY SMOKE, if the 

 funnel be very short ? 



