November 2:Si/i, igiO.] PROCEEDINGS. ix 



Ordinary Meeting, Noxembcr 28th, 191 6. 



Mr. T. A. Coward, F.Z.S., F.E.S., Vice-President, 

 m the Chair. 



A vote of thanks was accorded the donors of the books 

 upon the table. Among these were : " Science as Enemy and 

 Ally,'' by E. Crocker (8vo., Birmingham, 191 5), presented by the 

 Birmingham and Midland Institute; and " The Weather Map," 

 by N. Shaw (i6mo., London, 19 16), presented by the Meteoro- 

 logical Office, London. 



Mr. J. Wilfrid Jackson, F.G.S., exhibited a number of 

 faceted pebbles from Pendleton. Ho stated that almost 200 

 of these had been collected within the last six months from 

 near the top of a section of current-bedded and faulted Glacial 

 sand and gravel, at an altitude of about 200 feet O.D. 



The specimens occur in sitii some two or three feet below 

 Ihe capping of darker subsoil, which contains cores and flakes 

 of flint, including pigmies. They are composed of slate, 

 granites (Eskdale and Shap), Ennerdale granophyre, Bor- 

 rowdalc volcanic tuffs, piorphyries, quartzites, millstone grit, 

 sandstones, chalk flints, carboniferous chert, and other rocks. 



The facets are mostly concave, grooved, or fluted. Some 

 stones have but one facet; others, two or more. One, with a 

 flat top, exhibits five incipient facets. The dimensions of the 

 largest faceted pebble are 11^, by 8| inches by 7 inches high; 

 and the smallest is but half an inch in diameter. 



Differentiation, according to varying hardness and compo- 

 sition, is well displayed. 



The pebbles are of Glacial origin. Some occurred in the 

 sand completely inverted. Of those orientated in situ, \\\c 

 facets faced north-westwards, westwards, and south-westwards, 

 I.e., the directions of the present prevailing winds. 



Dr. F. E. Bradley, M.A., MCom., F.R.S.E., made a fur- 

 ther communication as to the presence of arsenic in baking 

 powder. In some cases the amount of arsenic detected was 

 about 25 times the amount permitted by the authorities, but 

 was nevertheless practically negligible, because of the small 

 f)roportion of the powder which passed into the ultimate food 

 product. Dr. Bradley's investigations showed that the arsenic 

 I)resent in samples of baking powder recently sold was con- 

 tained only in the acid phosphate of lime lately used in these 

 powders in place of the tartaric acid or cream' of tartar more 

 generally employed, and only in those cases where the phos- 

 phoric acid used in the preparation of the acid phosphate had 

 been made by means of pyrites-prepared sulphuric acid. He 

 suggested that only brimstone-prepared sulphuric acid should 

 be i)ermitted to be used in the preparation of any phosi)horic 

 acid which entered into the manufacture of foodstuffs. 



