TTIE LAST DECADE. 
435 
found during the excavation in making a reservoir on Lumley ^loor 
for the supply of Ri])on witli water. The occurrence of a large 
boulder, 2 feet 6 inches in diameter, of coarse grit stone of nearly 
spherical form, was recorded from the black bed coal at Wortley, 
near Leeds, by Mr. Charles Brownridge. Three other smaller 
boulders of quartzite were also found in the same stratum near the 
same locality.' The author advanced the theory that these boulders 
had been carried to their position by masses of floating vegetation in 
a manner similar to that recorded by travellers on such rivers as the 
Amazon, where in the swamps and shallows such masses are seen 
floating, carrying foreign matters along with them. 
Mr. Jas. E. Bedford described the discovery of a number of flint 
implements which he had found in the Isle of Man. 
Mr. Thomas Tate gave the first of a proposed series of papers 
on Yorkshire Petrology, in which he described the Lamprophyres 
occurring in the erupted rocks in the neighbourhood of Ingleton. 
Three dykes of intrusive rock, more or less closely associated, occur 
in the Borrowdale and Conistone limestone groups, which form the 
bed of the Chapel-le-dale Beck. These are described both in bulk, 
and after microscopical examination of thin slices. The paper is 
illustrated with coloured figures of the sections, as well as by enlarged 
details of the constituent parts of the rocks. 
The formation of the line of railway from Skipton to Ilkley 
afforded ^Ir. S. A. Adamson an opportunity to study the contorted 
limestone and shales of the district and the superincumbent glacial 
beds, a description of which he contributed to the Proceedings of 
the Society. 
Mr. James W. Davis recorded the identification of a fossil species 
of Chlamydoselachus, and contributed a paper on the ancient flint- 
users of Yorkshire. 
