November 10, 1911] 



SCIENCE 



649 



the elements can be nearly as well placed on other, many elements in the first being as 

 the curve by using the successive differences much too advanced as those in the other are 



Fig. 4. Equatorial and Quadrantal Eelations. Values of the eleetropotentials of the 

 elements in detail. The printed numbers represent the order of these values, beginning with 

 the highest. All the horizontal expressions refer to all the elements of the hemisphere in which 

 they are placed. 



of the densities, and that the inequalities of retarded. So that a table made by taking the 

 the tvco curves largely counterbalance each average position indicated by the atomic 



