380 Geological Society: — > 



Sun-spot prevalence accordant with Authority. 



n tt j 11. i. * f Piazzi Smvth. 



6. Underground temperature * . . . . l "F T H *" e 



7. Depth of rivers in northern Europe. 



8. Fluctuation of level of American lakes . G-. M. Dawson. 



9. Severe famines and scarcities in India . . Sir "W. Robinson. 



10. The vine-crop A. Schuster. 



(' Nature ' 

 Balfour Stewart. 



There are several other points in Mr. Blanford's Eeport and in 

 the memoirs which are well worthy notice ; but our space forbids. 

 Indeed both publications are so full of interest that we cannot do 

 better than refer the reader to them for the latest information 

 relative to Indian meteorology, which is likely to attain a prominent 

 place in meteorological literature. 



L. Proceedings of Learned Societies, 



GEOLOGICAL SOCIETY. 

 [Continued from p. 232.] 



February 25, 1880.— Eobert Etheridge, Esq., E.E.S., 

 President, in the Chair. 



THE following communications were read : — 

 1. " On the Geology of Anglesey." By Prof. T. M c Kenny 

 Hughes, M.A. 



The author brought forward evidence to show that, resting on 

 the central gneissic axis of Anglesey, there was a series of conglo- 

 merates which he referred to the base of the Cambrian ; that the 

 Lingula-flags had not yet been recognized ; that the conglomerates 

 were followed by the brown sandstones hitherto referred to Caradoc, 

 but which he identified by the included fossils with Tremadoc ; that 

 the lower part of the Black-Shale Group was Arenig, as shown by 

 the Graptolites ; while he thought that the higher parts of the 

 Black-Shale Group might turn out to be Lower Bala ; that the 

 Black Shales pass under the Gnarled Schists. He then adduced 

 evidence to show that these Gnarled Schists were not foliated or in 

 any way true metamorphic rocks, but only crumpled laminated beds 

 in which all the alteration that had taken place was of the nature 

 of vein-structure, and a kind of universal slickenside, consequent 

 upon the crushing of a rock consisting of thin laminae of different 

 texture ; and suggested that the whole might be, like the green 

 slates &c. of Chapel-le-dale, in Yorkshire, the water-sorted out- 

 lying equivalents of volcanic rocks elsewhere, and be contempo- 

 raneous with the Snowdon volcanic series. 



* " A Committee, of which General R. Strachy is a member, is now sitting in 

 London, to consider the best means of investigating the whole question of Solar 

 Physics ; andlhave lately been informed that the Astronomer Royal, who is also a 

 member of the Committee, considers that the regular observation of earth-tem- 

 perature by means of buried thermometers, somewhat similar to those employed 

 by Professor Piazzi Smyth, at Edinburgh, would be of much service to this end." 

 — H. F. Blanford's Report. 



