246 REPORTS OF MEETINGS. 



GEOLOGICAT. SECTION. 



THE section held two meetings. At the first, the Presi- 

 dent gave some account of his investigation into the 

 geology of the St. David's district, the results of which are 

 published in the Quarterly Journal of the Geological Society 

 for May, 1890. He also briefly described the Brislington 

 cutting between Bristol and Bath on the Great Western 

 Railway. 



At the second meeting the President exhibited and illus- 

 trated the use of a rock-section cutting or lapidary machine, 

 and showed slides of oolitic limestone, and St. David's igneous 

 rocks. He also exhibited sections of Mountain Limestone 

 chert, showing crystalline, chalcedonic, and amorphous silica. 

 Crinoidal ossicles and other fossils converted into white silica 

 were also shown ; and Professor Lloyd Morgan explained that 

 he had obtained them by treating the limestone of Pore Hill 

 quarry, Portishead, with dilute acid. The limestone dis- 

 solves, and the silicified ossicles remain. A similar lime- 

 stone with similar ossicles is found on Denny Island. 



Two excursions were made. The first was to Ebbor, near 

 Wookey. Professor Lloyd Morgan explained the geology of 

 the Ebbor Valley, and briefly described the geology of Em- 

 borrow. The substance of his remarks will be found in the 

 Mendip Notes on a previous page. 



The second excursion was to the railway cutting (by the 

 courteous permission of the authorities of the Midland Hail- 

 way Company) between Tytherington and Thornbury. 

 The President explained the geology as described in his 

 paper in the last number of the Proceedings. 



A third excursion was planned to Burrington Combe and 

 Cheddar, but had to be abandoned owing to heavy rain. 



