io2 THE BRITISH NATURALIST. 



had solved the mystery, by being in spiritual communication with the 

 shade of the late Mr. Haworth. — J. W. Tutt, March 20th, 1894. 



Geological Photographs. — During the last few years the sugges- 

 tion, made at one of the meetings of the British Association, that a 

 Geological Photographic Survey should be undertaken, has been 

 more or less acted on. A number of views worked in the per- 

 manent platino process have been taken for the National Collection 

 of the Geological Photographic Committee of the British Association, 

 and Granville A. Cole, F.G.S., M.R.I. A., Professor of Geology in the 

 Royal College of Science, Dublin, assisted by Mr. McHenry, of the 

 Geological survey of Ireland, has supplied the requisite descriptive 

 matter to each view. In looking through some of these aids to the 

 study of geology several appeal very forcibly to us, and amongst them 

 may be specialised " Pockets of Altered Flints," — as shown in the 

 cuttings of 'the Cave Hill quarries, Belfast, — and eroded surface of 

 indurated chalk, the latter with bands of flints in situ, overlain by 

 basalt. The flints in this area, on the old eroded chalk surface, are 

 frequently reddened and baked by the action of the Eocene lava 

 streams. The section in the volcanic neck filled with ash and 

 agglomerate at the Bridge of Carrick-a-Rede, Co. Antrim, offers 

 materials for the study of volcanic action, and Pleaskin Head, in the 

 same county, a structure of massive and columnar basalt lava flows, 

 374 feet high, offers further opportunities of studying those early 

 changes in the earth's crust. The higher flows are beautifully 

 columnar in their lower portions, and show the typical upper layer of 

 more finely columnar and irregular structure. There is a band of 

 pisolite iron ore running half way up the cliff. In Kenbane 

 Head we have the illustration of a narrow, seaworn promonotory 

 of chalk. The Basalt plateau of Rathlin Island is seen in the 

 distance. The promontory is intersected by basalt dykes, which 

 weather out as caves ; while in the photograph of Murlough Bay, also 

 in the County Antrim, the metamorphic rocks are well brought out, as 

 are likewise ancient schists, lower carboniferous coal bearing strata 

 and intrusive dolerites. In the foreground the schists are at the sur- 

 face ; in the middle distance are carboniferous rocks, penetrated by 

 intrusive schists, which are weathered out into scarps and sea-stacks, 

 while in the distance is sighted the great cliff of the intrusive dolerite of 

 Fair Head, with gentle slopes of lower carboniferous sandstone. 

 The selection includes the cretacous and carboniferous rocks, dolerite, 

 estuarine deposits, igneous rocks, new red and old red sandstone 

 deposits, raised beaches, and stratifications, &c, &c, and the list, which 

 can be obtained from Mr. Robert Welsh, Lonsdale Street, Belfast, is 

 well worthy the attention of all who take any interest in the inter- 

 changing phenomena of the earth's surface. 



