IN THE PRESENCE OF STRONGLY HYDRATED SALTS. 



47 



substance investigated were employed, in order to bring out the two most 

 important water-bands in the region of the spectrum used. This could 

 not be done by studying only one depth of solution, since the depth which 

 was necessary and sufficient to bring out clearly one of these water-bands 

 would not bring the other out in the way desired. By using the two depths 

 of solution, and studying them in the manner above described that is, 

 by the differential method we were able to study both of the water-bands 

 as produced, on the one hand by the pure solvent, and on the other by the 

 solution. 



In tables 6 to 10, under X, are given the wave-lengths of light that were 

 passed through the solution; and under I/Iq the percentage of transmission, 

 on the one hand, of the solution; and on the other, of water having a depth 

 exactly equal to that of the water in the solution. 



Table 7. 



