RECENT ADVANCES IN SCIENCE 389 



In this case it may well be that that which is obvious is also 

 true. Penck's fourth period (like the " Northern Drift " of 

 Wales) was admittedly less severe than the preceding period, 

 and it must not be forgotten that Penck himself placed the 

 Chellean age in his second, not in his third, interglacial period. 

 Much greater space is needed for dealing with questions of 

 this character, but I would suggest that the Chalky Boulder 

 Clay may correspond, not with the Wiirm, but with the Riss 

 (third) glacial period of the Alps. 



Among the other articles in the Proceedings is a contribution 

 by Prof. W. J. Sollas, entitled : " A Flaked Flint from the Red 

 Crag." After dealing in a critical manner with another of the 

 sub-Crag flints, Prof. Sollas adds a postscript to the article 

 accepting as human artefacts certain of the sub-Crag flints, 

 though he suggests (quite rightly, I think) that they were made, 

 not by man, but by some sub-human tool-making animal. 

 This conversion of Prof. Sollas is somewhat notable, as he was 

 for long one of the strongest opponents of the sub-Crag flints. 



In the Proceedings of the American Philosophical Society , 

 vol. lix, No. 3, an interesting, if not very analytical, article on 

 " Slav and Celt " is contributed by J. D. Prince. The author 

 thinks that there is much in common in the mentality of these 

 two groups of peoples. 



The following articles on physical anthropology may be 

 mentioned : 



In the American Journal of Physical Anthropology , vol. ii, 

 No. 4 : " Eruption and Decay of Teeth in Negroes and Whites," 

 by V. Suk ; and " Lefthandedness," by A. L. Beeley. And in 

 Man (August) : " Notes on the Physical Anthropology of Certain 

 West African Tribes," by L. W. G. Malcolm. 



And the following articles on prehistoric anthropology may 

 be mentioned : 



In the Proceedings of the Royal Society, Series B, vol. xci. 

 No. B, 640 : " On Some Rostro-carinate Flint Implements and 

 Allied Forms," by Sir E. Ray Lankester. And from the Proc. 

 Prehist. Soc. E. Anglia (as above) : "A New Celt-making 

 Floor at Grime's Graves," by D, Richardson ; and " Imple- 

 ments from the Glacial Deposits of North Norfolk," by J. Cox. 



MEDICINE. By R. M. Wilson. M.B., Ch.B. 



Introduction. — ^The writer of the following notes on medical 

 progress does not profess to deal with this from the point of 

 view of the special worker. Rather he addresses himself to 

 all who are interested in scientific thought, and who desire to 

 follow what may perhaps be called the larger movements. 

 Medicine is at the moment in one of its transition stages, and 

 the future is by no means so clear as some appear to think. It is 



