146 Notes and Comments. 



the Quarterly Journal of this Society, in addition to numerous 

 works published elsewhere. His researches in British cave- 

 deposits and in mammalian palaeontology have long been well 

 known and highly valued. He has shown that mammalian 

 remains can be used in the classification of the Tertiary strata, 

 and in many ways has cast light upon some interesting chapters 

 in the later geological history of Europe. In another direction 

 he has made important additions to our knowledge of the geol- 

 ogy of the Isle of Man. His long connexion with the Victoria 

 University and the support which he has given to the Manches- 

 ter Geological Society have done much to promote the study 

 of geology in Lancashire; and his well-known publications 

 " Cave Hunting " and " Early Man in Britain " met the needs 

 of a wide circle of readers. Even more, perhaps, will the name 

 of Prof. Dawkins be always associated with the discovery of the 

 Kentish Coalfield, in which he guided to a successful issue an 

 enterprise that had already exercised the mind of Prestwich 

 himself. The site of the boring at Dover was selected after a 

 careful survey of the district, and much patient labour was 

 expended on the examination of the cores and the identifica- 

 tion by their fossils of the several geological horizons pierced. 

 Apart from the material success realized, there was in this way 

 accumulated a body of information, which has important ap- 

 plications to the stratigraphy and tectonics of South-Eastern 

 England.' 



DR. A. HARKER'S address. 



At the same meeting the President, Dr. Harker, in his 

 address, discussed the present position and outlook of the 

 study of metamorphism. The rapid development of physical 

 chemistry and the successful application of experimental 

 methods to petrological questions have greatly changed the 

 situation during recent years, and for the first time it seems 

 possible to approach the subject of metamorphism systematically 

 from the genetic standpoint. For the geologist this implies 

 the critical study, not only of the great tracts of crystalline 

 schists and gneisses, but equally of metamorphic aureoles, of 

 pneumatolysis and other contact- effects, and of the phenomena, 

 mechanical and mineralogical, related to faults and overthrusts. 

 It implies, moreover, the recognition that these are all parts of 

 one general problem, that of the reconstruction of rocks under 

 varying conditions of temperature and stress. In practice, 

 this problem is complicated by the fact that perfect adjustment 

 of chemical equilibrium cannot be assumed, either in the rocks 

 prior to metamorphism, or during the process of metamorphism 

 itself. 



recrystallization in a solid environment. 



Some consideration was devoted to the solvents which play 

 an essential part in metamorphism and to the limits of migra- 



Naturalitt, 



