The Absorption Coefficient of Solution for Monochromatic Radiation. 19 



work. These discrepancies between the values of a are such as arise 

 from the use of an instrument of low dispersion with relatively wide 

 slit-widths. Although Aschkinass does not record the width of the 

 slits, it is believed that the employment of different spectrographs is 

 the cause of the differences in the values of a . 



For wave-lengths shorter than 900/z/z the values of a recorded here 

 are much greater than those found by Aschkinass. The absorption 

 of water is quite small in this region and probably Aschkinass is more 

 nearly correct, for he was able to use longer cells for the measurements. 

 However, the values of a found in this work are the ones used for the 

 calculations of A. 



TABLE 3. The Absorption Coefficient of the Solvents (Fig. 8). 



