On the Influence of Color on Radiation. 



27 



The following table presents the comparison, the substances being 

 arraqged in the order of their radiating powers. 



The results thus exhibited are decidedly unfavorable to the specific 

 effect of color in determining the radiating powers of bodies. Blue 

 is above black at the beginning of the table, and occurs again in the 

 eighteenth place. Although the first seven numbers are blue or 

 black, the ninth, tenth, eleventh, and twelfth, are white, black, blue, 

 and white respectively. Red occupies the eighth and nineteenth pla- 

 ces, and then an intermediate one, namely, the fifteenth. White is in 

 the greater number of cases in the middle part of the table, ranging 

 close to black. 



