TEACHER'S LEAFLETS 



FOR USE IN THE PUBLIC SCHOOLS. 



PREPARED BY 



THIRD EDITION. 

 No. 2. 



MAY 21, 1897. 



THE COLLEGE OF AGRICULTURE, 

 CORNELL UNIVERSITY, 



Issued under Chapter 128 

 of the Laws of 1S97. 



ITHACA, N. Y. 



How a Candle Burns. 



BY GEORGE W. CAVANAUGH, 



I. Oxygen. 



Light the candle and place it upon a 

 piece of blotting paper. 



Qties. What do you see burning ? 

 Ans. The candle; or the wick and 

 wax (or tallow). 



Ques. Is anything burning besides 

 the candle ? 



The answer will probably be " No." 

 Well, let us see. Place the lamp chim- 

 ney over the lighted candle, and partly 

 cover the top by a piece of stiflf paper, 

 as in Fig. 15. Ask the pupils to observe 

 and describe how the flame goes 

 out ; i. e., that it is gradually ex- 

 tinguished and does not go out 

 instantly. 



Ques. Why did the flame go 

 out? 



The probable answer will be, " Because there was no air." 

 (If there was no air within the chimney, some could have entered 



Note to the Teacher.— The materials needed for this exercise are a piece 

 of candle about two inches long, a lamp chimney (one with a plain top is best), a 



15. 77te beginning of the experiment. 



