Vol. 70.] PROCEEDINGS OF THE GEOLOGICAL SOCIETY. vii 



instrument. Two flint-implements were also exhibited which, by 

 the difference of patina, indicated that they had been reworked at 

 a much later date. 



Mr. W. Dale exhibited a series of naturally-formed or naturally- 

 fractured flints ; these included an assortment of flakes caused by 

 the bursting or expansion of the flint. One of these, on the base 

 of an Echinoid, remains in situ, and can be taken out and replaced 

 in the cavity. Some specimens illustrated the ; starch-fracture 1 

 arising from the partly crystalline nature of the flint, and producing 

 irregular prisms. From implementiferous gravels he exhibited a 

 quantity of the fossil organisms known as Coscinopora . In the 

 Chalk these are imperfectly pierced, but in the gravel the holes 

 become enlarged, and Sir Charles Lyell and Mr. Worthington 

 Smith thought that they might have been used as ornaments. The 

 specimens shown were obtained from a gravel-digger, who was in 

 the habit of placing them on strings. Flints which simulate 

 Palaeolithic implements in their form were also shown, and a col- 

 lection of natural shapes somewhat resembling animal forms — one 

 of them strikingly like a human head. The speaker would not 

 have thought it worth while to show these last, but for the fact 

 that the vagaries of the late Auberon Herbert had found another 

 exponent, and the Journal of the British Archaeological Association 

 had this year published drawings of a number of these objects and 

 advanced them to the dignity of artefacts. 



Mr. X. F. Roearts wished to draw particular attention to some 

 of the Eoliths which he exhibited, found upon the plateau of the 

 Xorth Downs in Surrey, at 800 feet above O.D., near the crest of 

 the escarpment. Of these some were rolled, and it was therefore 

 evident that they must have been derived from the Chalk dome 

 which formerly existed over the Weald. 



Mr. Gr. W. Lamplugii showed a fragment of glaciated clav- 

 stone of rectangular shape from the Boulder Clay of a Flintshire 

 colliery- shaft, as an example of the artificial aspect occasionally 

 brought about by natural fracture. The shape of this example 

 was remarkably close to that of a manufactured whetstone. The 

 speaker observed that, where the cause of fracture was uncertain, 

 it became of prime consequence to know the proportion that selected 

 specimens bore to the total number examined : since, if the supply 

 of naturally-fractured stones be unlimited, exceptional types, such 

 as the specimen that he exhibited, must occasionally be found. 



Mr. W. H. Cook exhibited fifty examples of Eoliths and thirty 

 Palaeoliths collected from the northern flank of the Weald. As 

 a result of his investigations, the speaker questioned the pre- 

 Palaeolithic age of the Eoliths of this area : for, during the last six 

 years, he had found considerable numbers of Palaeoliths lying in 

 conjunction, with Eoliths on the surface, at levels ranging from 



