CONTENTS. 



Proceedings of the Geological Society, Session 1920-21, including the 

 Proceedings at the Annual General Meeting, the President's Anniversary- 

 Address, etc i-xcii 



PAPERS READ. 



Page 



1. Mr. R. D. Oldham on a Seasonal Variation in the Frequency of Earth- 



quakes (Second Commiinication) 1 



2. Miss M. E. J. Chandler on the Arctic Flora of the Cam Valley at Barnwell, 



Cambridge 4 



3. Mr. n. Bolton on Arch imylacris jiringlei, sp. nov. (Plate I) 23 



4. Mr. D. Davies on the Ecology of the Westphalian and the Lower Part of 



the Staffordian Series of Clydach Vale and Gilfach Goch (Plate II) ... 30 



[The Editor of the Quarterly Journal is directed to make it known to the Public 

 that the Authors alone are responsible for the facts and opinions 

 contained in their respective Papers.] 



*^* The Council request that all communications intended for publication by the 

 Society shall be clearly and legibly written on one side of the paper only, with 

 proper references, and in all respects in fit condition for being 

 at once placed in the Printer's hands. Unless this is done, it will be in 

 the discretion of the Officers to return the communication to the Author for revision. 



t 

 The Library at the Apartments of the Society is open every Week Day from Ten 

 o'clock until Five, except on Saturdays (when the hours are from 10 to 1), and 

 except during the fortnight commencing on the first Monday in September, 

 when the Library is closed for the purpose of cleaning. 



Fellows are reminded that they are not entitled to receive the 

 Uuarterly Journal regularly, unless a subscription at the rate of 

 10s. per volume is paid in advance. Those Fellows who do not 

 require the complete series can obtain separate parts at the price 

 of 35. each, if applied for within one year of the date of issue. 



