Reports and Proceedings — Geological Society of London. 179 



V. — Proceedings of the Cotteswold Naturalists' Field Club 

 FOR 1892-1893. Vol. XL Part I. 1893. 



THIS Part contains the address of the retiring president, Mr. 

 W. C. Lucy, who gives an account of the work of the session, 

 and of the excursions made to Woolhope, Bath, Cleeve HiH, and 

 Newent. He refers in particular to the Drifts of the Cotteswold area, 

 and also gives a section of the Coalfield near Newent. 



There is, in addition, an elaborate paper by Mr. Etheridge " On 

 the Rivers of the Cotteswold Hills within the Watershed of the 

 Thames and their importance as supply to the main river and the 

 Metropolis." This paper gives in detail much of the information 

 brought before the late Eoyal Commission on Water Supply by 

 Mr. Etheridg-e. 



VL — Handbook to the Collection op British Pottery and 

 Porcelain in the Museum of Practical Geology. 8vo. 

 pp. 178, with 132 Illustrations. London: Printed for Her 

 Majesty's Stationery Office. Price Is. 



A NEW edition of the Catalogue of the Pottery and Porcelain 

 jTL in the Jermyn Street Museum has long been wanted. The 

 Third Edition, by Trenham Reeks and F. W. Rudler, was published 

 in 1876. The present work, which has been prepared by Mr. 

 Rudler, is arranged so as to form a Handbook rather than a Cata- 

 logue. Thus the matter is arranged throughout in a readable form, 

 with references only to particular specimens, instead of containing 

 descriptions of all the objects on exhibition. The work is brought 

 up to date by additional information, and thus forms an authoritative 

 ffuide to the student. 



E,EJI=OI^TS .i^J^HD IPE-OGIKilKilDIlfTCB-S. 



Geological Society of London. 



L— February 7th, 1894.— W. H. Hudleston, Esq., M.A., F.R.S., 

 President, in the Chair. The following communications were read : 



1. " On some cases of the Conversion of Compact Greenstones 

 into Schists." By Prof. T. G. Bonney, D.Sc, LL.D., F.R.S., F.G.S. 



By the path leading from the Bernina Hospice to the GriJm Alp 

 (Engadine) some masses of compact green schist are seen, inter- 

 calated in a rather crushed gneiss. They prove to be intrusive 

 dykes modified by pressure. Microscopic examination of specimens 

 from these reveals no trace of any definite structure indicating an 

 igneous rock ; a slice, cut from one of the masses within an inch or 

 so of a junction, shows it to be a foliated mass of minute chlorite or 

 hydrous biotite, with granules of epidote (or possibly some sphene) 

 and of a water-clear mineral, perhaps a secondary felspar. An 

 actual junction shows a less distinct foliation and some approach to 

 a streaky structure. A slide from the middle of another dyke 

 (about 18 inches thick) exhibits a more coarsely foliated structure 

 and minerals generally similar to the last, except that it may contain 



