104 



PROCEEDINGS OP THE AMERICAN ACADEMY 



The measured intervals between the components of pairs, treated 

 in the same way, become — 



The first line in the following table gives the value of the compo- 

 nents of the B group on the scale B to B 12 = 1. The difference of 

 wave-length corresponding to this interval is 61 tenth meters, and 

 the numbers in the second line are obtained by multiplying those in 

 the first by 61. 



