RECENT ADVANCES IN SCIENCE 31 



have recently appeared. Space will not permit of their being 

 reviewed here, but a few references may be given : Dale 

 (J. Amer. Chem. Soc. 191 6, 38, 2187) on the Preparation of 

 Bromacetyl-glucose, etc. ; Irvine and Robertson (/. Chem. 

 Soc. 1916, 109, 1305), Evidence indicating the existence of 

 a new variety of fructose, etc. ; Haworth and Shaw (/. Chem. 

 Soc. 19 16, 109, 1 3 14) on the Structure of Sucrose. 



GEOLOGY. By G. W. Tyrrell, A.R.C.Sc, F.G.S., University, Glasgow. 



Stratigraphical and Regional Geology 



Ulrich, E. O., Correlation by Displacements of the Strand-line, and the Function 



and Proper Use of Fossils in Correlation, Bull. Geol. Soc. Amer. 1916, 27, 



451-90. 

 Schuchert, C, Correlation and Chronology in Geology on the Basis of Palaso- 



geography, ibid. 491-514. 

 Matthew, W. D., Methods of Correlation by Fossil Vertebrates, ibid. 515-24. 

 Knowlton, F. H., Principles governing the Use of Fossil Plants in Geologic 



Correlation, ibid. 525-30. 

 Schuchert, C, Silurian Formations of South-Eastern New York, New Jersey, 



and Pennsylvania, ibid. 531-54. 

 Foerste, A. F., Upper Ordovician Formations in Ontario and Quebec, Geological 



Survey of Canada, Memoir 83, 191 6, pp. 279. 

 Mackenzie, J. D., Geology of Graham Island, British Columbia, ibid, Mem. 88, 



1916, pp. 221. 

 Darton, N. H., Geology and Underground Water of Luna County, New Mexico, 



United States Geological Survey, Bull. 618, 191 6, pp. 188. 

 Andrews, E. C, Notes on the Structural Relations of Australasia, New Guinea, 



and New Zealand, Journ. Geol. 1916, 24, 751-76. 

 Bailey, E. B., and Maufe, H. B., The Geology of Ben Nevis and Glen Coe, 



Mem. Geol. Surv. of Scotland, 191 6, pp. 247. 

 Hughes, E. W., Geology of Cil-y-Coed District (Carnarvonshire), Geol. Mag. (6), 



1917,4, 12-25, 75-8o. 

 Strahan, A., Geology at the Seat of War, ibid. 68-74. 



The nature of the papers forming a symposium on the subject 

 of stratigraphical correlation by Ulrich, Schuchert, Matthew, 

 and Knowlton, is sufficiently indicated by their titles. Ulrich 

 emphasises the importance of diastrophic criteria in the deter- 

 mination of the natural divisions of geological history. He 

 also insists on the value of minute differences between fossils 

 for stratigraphic purposes, based on the belief that combina- 

 tions of biologically unimportant characters can have existed 

 but once and only for a short period of time. 



In his interesting work on the larger geological relations of 

 Australasia, New Guinea, and New Zealand, Andrews comes 



