5;o SCIENCE PROGRESS 



on the application of petrographical methods to the study of 

 refractories ; Drs. Howe and Strahan report on the work of 

 the Geological Survey in regard to refractory raw materials ; 

 and Prof. Boswell discusses the properties and resources of 

 refractory sands in this country. 



In a discussion of " The Problem of the Great Australian 

 Artesian Basin " (Journ. and Proc. Roy. Soc. New South Wales, 

 191 7, 51, 135-208), A. L. Du Toit agrees with Prof. J. W. 

 Gregory in regarding the water as of composite nature, originat- 

 ing from three sources : residual (Mesozoic), plutonic, and rain- 

 fall of an earlier epoch (Tertiary). In opposition to Prof. 

 Gregory, however, he holds that the meteoric supply is at 

 present dominant, but that the water actually stored has been 

 derived in large measure from the above sources. 



Other references relating to economic geology are as follows : 



Maclaren, M., The Geology of the East Pool Mine, Cam- 

 borne, Cornwall, Mining Mag. 191 7, 16, 245-9. 



Griffiths, A. D., The Wolfram Deposits of Burma, ibid. 

 60-66. 



Jensen, H. I., et alia, The Geology of the Woggaman 

 Province, Northern Territory of Australia, Bull. Northern 

 Territory, No. 16, 191 6, pp. 72. 



Boulton, W. S., The Clays of South Staffordshire and 

 its Borders, Trans. Ceramic Soc. igi6-iy, 16, 237-58. 



Harrison, J. B., On the Occurrence of Bauxite in British 

 Guiana, Reports and Correspondence relative to Bauxite in British 

 Guiana, 1910-17, 1917, pp. 31. 



Dynamical and Structural Geology. — The contents of the 

 papers referred to below may be largely gathered from their 

 titles : 



Wood, H. O., On Cyclical Variations in Eruption at Kilauea, 

 Second Report of the Hawaiian Volcano Observatory, 191 7, pp. 

 1-59. 



Jaggar, T. A., jun., Live Aa Lava at Kilauea, Journ. 

 Wash. Acad. Sci. 191 7, 7, 241-3 ; On the Terms Aphrolith 

 and Dermolith, ibid. 277-81 (these terms are introduced to 

 replace the barbarous words " aa " and " pahoehoe " applied 

 to different types of surface structures in lavas) ; Thermal 

 Gradient of Kilauea Lava Lake, ibid. 397-405. 



Frater, M., The Volcanic Eruption of 191 3 on Ambrym 

 Island, New Hebrides, Geol. Mag. 191 7, 4, 496-503. 



