Reviews — Proceedings of Chester Natural Science Society. 89 



From a circular just issued we learn that the present Editor 

 would gladly welcome further assistance, and would be especially 

 thankful if authors would forward to him brief notices of papers, etc., 

 appearing in the publications of provincial societies, which are often 

 not easily obtained in London. Authors, secretaries of societies, and 

 editors of geological publications would also greatly assist the work 

 by forwarding copies of their publications to the Editor of the 

 "Geological Eecord," 28, Jermyn Street, London, S.W. 



VI. — Proceedings of the Chester Society of Natural Science. 

 No. 3. 8vo. pp. 1 34 ; 9 Plates. (Printed and Published by Giles 

 Griffith, Chester, 1885.) 



THE present volume includes fifteen papers upon various subjects 

 read before the Society from 1878 to 1884. Of these papers 

 eight are of geological and palaeontological interest. 



The first is by the President of the Society, Prof. T. McKenny 

 Hughes, M.A., F.G.S., entitled "Notes on the Geology of the Vale of 

 Clwyd." As to the merits of this paper it is sufficient to say 

 that it is upon a subject which is peculiarly the author's own. It is 

 illustrated by eight plates (23 figures), and is a most valuable con- 

 tribution to the geology of the district. After a short introduction, 

 the rocks found in the Vale of Clwyd are briefly described in order, 

 beginning with the oldest or Bala series, and passing upwards to the 

 recent Cave-deposits. Under each formation we have a list of its 

 chief fossils and peculiarities of structure and comparisons with the 

 same horizons in other districts, along with valuable local notes as 

 to where the most interesting sections may be most easily observed. 

 There is a valuable note " On the Weathering of Mountain Limestone," 

 explaining in a very clear manner the formation of those caves with 

 which we are all so familiar in limestone districts, and at the same 

 time mentioning places where the effect of the weathering may most 

 easily be observed. It is impossible to over-estimate the importance 

 of such a paper as this to local geologists ; for, rich as it is in facts 

 and details, it is still richer in suggestions which need for their 

 working out the time and patience of the local geologist ; and we do 

 not doubt that this paper by the President will originate much good 

 work, which will appear in future volumes of the Proceedings. 



The next paper is by Mr. Aubrey Strahan, M.A., F.G.S., on " The 

 Denudations of North Wales." This is an admirable paper by one 

 who for a long time was associated with the Society as Honorary 

 Curator of the museum, when he was engaged in the Geological 

 Survey of the district. In the present paper Mr. Strahan proposes 

 to examine the evidence, afforded by examples in this district, of the 

 fact that " while existing lands, being themselves chiefly formed of 

 stratified marine material, occupy the sites of seas of former 

 geological periods, on the other hand these seas overspread the ruins 

 of still more ancient continents." This paper is one which all local 

 geologists should read, and all the places mentioned will well l-epay 

 a fresh visit in the new light thrown on them by Mr. Strahan's paper. 



Then follows a paper by Professor Judd, F.Pi.S. — "A Problem 



