826 Geological Society : — 



Engineering/ vol. xi. no. 4*), and his account of the ' Fundamental 

 Theory of the Planimeter 'f . Chapter XIII. is devoted to ordinary 

 differential equations. The Appendix (some 50 pages) discusses 

 some of the matters in the text at greater length than is required 

 by the elementary student, and also contains a large collection of 

 the figures of the curves which are referred to in the exercises. 

 Answers are given to these exercises, and further there is a full 

 Index, and numerous brief historical notes which add to the 

 utility of an excellent text-book. Dr. Murray suitably acknow- 

 ledges his great indebtedness to his predecessors in the same field. 

 The book is very neatly and correctly printed, and is of handy size. 



XXVII. Proceedings of Learned Societies. 



GEOLOGICAL SOCIETY. 



[Continued from vol. xlvi. p. 508.] 



November 9th, 1898.— W. Whitaker, B.A., F.E.S., President, 



in the Chair. 



rpHE following communications were read : — 



-*- 1. " On the Palaeozoic Eadiolarian Eocks of New South Wales.' 



By Prof. T. W. Edgeworth David, B.A., F.G.S., and E. F. Pittman, 



Esq., Assoc. R.S.M., Government Geologist, New South Wales. 



2. ' On the Radiolaria in the Devonian Eocks of New South 

 Wales.' By G. J. Hinde, Ph.D., F.E.S., F.G.S. 



November 23rd.— W. Whitaker, B.A., F.E.S., President, 

 in the Chair. 



The following communications were read : — 



1. ' Note on a Conglomerate near Melmerby (Cumberland;.' By 

 J. E. Marr, Esq., MA., F.E.S., F.G.S. 



In this paper the author describes the occurrence of a con- 

 glomeratic deposit which shows indubitable effects of earth- 

 movement, not only on the included pebbles, bat also on the 

 surface of one of the deposits. The rocks are coloured as basement 

 Carboniferous rocks on the Geological Survey map. The Skiddaw 

 Slates are succeeded by about 30 feet of a roughly stratified con- 

 glomerate, followed by 20 to 30 feet of rock with small pebbles, and 

 that by a second coarse conglomerate. The pebbles possess the 

 outward form of glacial boulders, but many of them are slicken- 

 sided, fractured, faulted, and indented. The striae are often 

 curved, parallel, and covered by mineral deposit ; the grains of 

 the matrix are embedded in the grooves, while slickensiding often 

 occurs beneath the surface of the pebbles and the striae are seen 

 to begin or end at a fault-plane. The surface of rock beneath 



. * Chapter XII. of the work before us is almost a reproduction of this 

 article, as is also Appendix G which supplements the account in the text, 

 t Here suitable reference is made to Prof. Henrici's Report (British 

 Association, 1894) and to Prof. Hele Shaw's paper on 'Mechanical 

 Integrators ' (' Proceedings of Institution of Civil Engineers, ' vol. lxxxii. 

 1885). 



