Data for the Problem of Evolution in Man. 333 



(3) These elements exhibit gradations in properties such as re- 

 fractive index, atomic volume, melting-point, and boiling- 

 point, which find a fitting place on diagrams showing such 

 periodic relations. Some of these diagrams are reproduced in 

 the original paper. Thus the refractive equivalents are found 

 at the lower apices of the descending curves ; the atomic 

 volumes, on the ascending branches, in appropriate positions ; 

 and the melting- and boiling-points, like the refractivities, 

 occupy positions at the lower apices. 



Although, however, such regularity is to be noticed, similar to that 

 which is found with other elements, we had entertained hopes that the 

 simple nature of the molecules of the inactive gases might have thrown 

 light on the puzzling incongruities of the periodic table. That hope 

 has been disappointed. We have not been able to predict accurately 

 any one of the properties of one of these gases from a knowledge of 

 those of the others ; an approximate guess is all that can be made. 

 The conundrum of the periodic table has yet to be solved. 



'Data for the Problem of Evolution in Man. VI. A First 

 Study of the Correlation of the Human Skull." By ALICE 

 LEE, D.Sc., with some assistance from KARL PEARSON, F.RS., 

 University College, London. Pteceived July 13, Read 

 November 15, 1900. 



(Abstract.) 



The substance of this paper was a thesis for the London D.Sc. 

 degree ; it was shown to Professor Pearson, at whose suggestion con- 

 siderable modifications were made, and a revision undertaken with a 

 view to publication. 



In order to deal exactly with the problem of evolution in man it is 

 necessary to obtain in the first place a quantitative appreciation of the 

 size, variation, and correlation of the chief characters in man for a 

 number of local races. Several studies of this kind have been already 

 undertaken at University College. These fall into two classes, (i) those 

 that deal with a variety of characters in one local race, and (ii) those 

 which study the comparative value of the constants from a variety of 

 races. Thus Dr. E. Warren has dealt with the long bones of the Naqada 

 race,* Mr. Leslie Bramley-Moore has compared the regression equations 

 for the long bones from a considerable number of races in a memoir not 



* ' Phil. Trans.,' B, vol. 189, p. 135. 



