492 Intelligence and Miscellaneous Articles. 



2. " On a Deposit containing Diatomacece, Leaves, &c, in the 

 Iron-ore Mines near Ulverston." By Miss E. Hodgson. 



The object of this paper was to show that this deposit, which was 

 first described by Mr. Bolton in the Society's Journal, vol. xviii. 

 p. 274, and considered by him to be of lacustrine origin, was 

 deposited in a large cavern or chain of caverns by a subterranean 

 stream, originating probably in a brook called the ' Poaka Beck.' 

 The authoress first described in detail some of the various caverns 

 and swallow-holes which abound in the limestone of the district ; 

 and then alluded to the current belief of their communication 

 with each other, and with springs. Miss Hodgson also remarked 

 that, prior to the year 1842, the Poaka Beck, after having become 

 partially engulfed at Inman Gill, is said to have taken a sub- 

 terranean course. Since the above-named date, its course has been 

 diverted. Mr. Bolton's sections were then critically examined ; and 

 the paper concluded with a list of the Diatomacece found in the 

 deposit, with notes on the places where they occur in the streams 

 of the district, and with some remarks on the vegetable remains. 



3. " On the Geology of a part of the Masuiipatam District/' 

 By Capt. F. Applegath, Madras Army. 



The sections in the country west of the Palair River and north of 

 the Kistna River, described by the author, show the existence of a 

 synclinal in which the following rocks occur, beginning westward 

 and ascending : — Dark-coloured Schist, Red Schist, Black Lime- 

 stone, and Variegated Schist, the last forming the uppermost bed ; 

 from thence descending and proceeding eastward: — Limestone, 

 Micaceous Schists, and Olive and Brown Schists. The last bed 

 lies unconformably upon Flagstone, which is succeeded by coarse 

 Sandstone, and Gneiss forms the basement bed. 



4. " On the Association of Granite with the Tertiary Strata near 

 Kingston." By J. G. Sawkins, Esq., F.G.S. In a letter to Sir R. 

 I. Murchison, F.G.S. &c. 



The occasion of this letter was the discovery by the author of a 

 granitic formation traversing Jamaica in a direction from S.E. to 

 N.W., being the same as that of the earthquake- shocks. It pierces 

 the Carbonaceous series, and also the Tertiary strata, whence the 

 author concludes that it is of Tertiary age. It usually contains 

 copper-ores, and is often more or less decomposed. 



LXV. Intelligence and Miscellaneous Articles. 



ON THE MODIFICATIONS WHICH THE VELOCITY OF LIGHT EX- 

 PERIENCES IN GLASS AND MANY OTHER BODIES UNDER THE 

 INFLUENCE OF HEAT. BY M. H. FIZEAU. 



THE following is an analysis of the more complete memoir which is 

 shortly to be published in the Annates de Chimie et de Physique. 

 In the first part several experiments are adduced relative to inter- 

 ference-phenomena, observed with the yellow light emitted by a 

 monochromatic lamp. Making the experiment of Newton's ring? 



