162 DR CLARKE'S ADDRESS. 



gether with a specimen of Salix capraea, perforated by the caterpillar, 

 from the Hirsel. 



After dinner a long and interesting communication from Mr David 

 Milne was read concerning some lenticular shaped stones, which were 

 found imbedded in soft and slaty shale on the high and precipitous 

 banks of the Tweed, near Norham, on the north side of the river. 

 These stones on being fractured presented also a lenticular arrangement, 

 and were found to consist partly of arenaceous, partly of argillaceous, 

 matter. Mr Milne likewise mentioned the occurrence of similarly 

 shaped stones in a red sandstone quarry in the grounds of Ladykirk 

 House, about three-quarters of a mile above the spot where the stones 

 were situated in the shale. Mr Milne added some observations on the 

 frequent occurrence and probable formation of these stones ; the latter 

 he attributed to a peculiar process of crystallization excited among the 

 particles of the stratum where they were imbedded ; the predisposing 

 cause he attributes to the presence of a quantity of iron (which they all 

 contain) impregnating the particles, and giving them the tendency to 

 arrange themselves in this particular form. This process, he observes, 

 must have taken place previous to the consolidation of the strata in 

 which they are imbedded. Mr Milne farther observed, that he had pro- 

 ceeded to the bank below Norham Castle, where an old quarry was 

 situated, in search of certain pyriform stones. Owing, however, to the 

 quarry being filled up with rubbish, he was unable to procure any, but 

 he shewed several which had been obtained several years ago by Sir 

 David Milne when the quarry was worked. They vary in size from 

 two inches to two feet in diameter. Mr Milne concluded his paper by 

 proving from the different strata of sand and gravel at and near the vil- 

 lage of Norham, that the River Tweed had at some former period 

 flowed in a channel about twenty -five feet higher than that which it now 

 occupies. 



The Club met for the first time this year at. Eyemouth. " After 

 breakfasting with the Rev. Mr Turnbull, the members took their walk, 

 which lay along the sinuous rocky coast between Eyemouth and Col- 

 dingham. The day was favourable, and as the locality is a fine one, 

 the Club had often occasion to halt that they might leisurely examine 

 and admire many little creeks, basins, and promontories, rendered inte- 

 resting by their geological structure, or their rugged picturesqueness. 

 One place exhibited a very plain overlying of the sandstone above the 

 trap, and gave rise to much speculative conversation, which was inter- 

 rupted and deleted by the unexpected appearance of a fine Grampus, 

 sporting in the sea below. He moved, at measured pace, along the 

 coast northwards, and was so near as to afford a full view of him, that 

 no doubt was left of his character and designation. The zoologists saw 



