OF ARTS AND SCIENCES. 225 



Candle. Position. Dist. d. Dist. b + c. Ratios. Averages. 



43 



47 



42 

 44 



44 

 45 



42 

 43 





Percentage (average of six observations) 586 



Foolscap. 

 Candle. Position. t)ist. d. Dist. 6 -f- c. Ratios. Averages. 

 A a 67 33 *k I i_ m 



,4 a 66 34 



B a 69 31 T 



A a 68 32 ¥ .i 



B a 66 34 T 



A a 67 33 



^ a 67 33 ? 



^4 a 67 33 ^ 



B « 68 32 



^ a 67 33 



^ a 66 34 



£}ri. (3) 



s } * (4) 



Percentage (average of six observations) 2309 



" of light reflected from paper compared 



with mirror 405 



Percentage of total light reflected from mirror . . .586 



" of total light reflected from paper . . . .2373 



rect experiment 2309 



Difference 0064 



The above result is rather a remarkable confirmation of the cor- 

 rectness of the theory of this method of measuring reflection. 

 vol. xv. (n. s. vii.) 15 



