SPECIFIC EXCITING POWER OF DIFFERENT WAVE-LENGTHS. 



193 



The results for eosin are shown in Fig. 185 and for resorufin in Fig. 186. 

 In the case of the latter figure the values corresponding to those shown in 

 Fig. 184 are marked by circles. The crosses show the values obtained by 

 another set of observations which are not here recorded in detail. The 

 individual points on these curves show considerable erratic variation. In 



Fig. 185. Eosin. 



Intensity of fluorescence excited per unit of absorbed energy of different wave-lengths. Curve A gives the 

 coefficient of absorption and curve F the energy distributed in the fluorescence spectrum. 



many cases these can be traced back to irregularities in the original data, 

 doubtless due to some experimental errors. In making computations we 

 have made no effort to eliminate these errors by smoothing the curves, but 

 have taken each observation as it stood and carried through the work to 



Fig. 186. Resorufin. 



Intensity of fluorescence excited by different wave-lengths per unit of absorbed energy. The circles and 

 crosses give the results of two independent sets of observations. Curve A gives the coefficient of 

 absorption and curve F the energy distribution in the fluorescence spectrum. 



the final result. Smooth curves have, however, been drawn among the 

 computed points. The data and results recorded here represent the best of 

 a number of series of observations. While those not recorded gave more 

 irregular results than here shown they all agreed in indicating the same 

 general trend in the final curve. 



