28 



■Jones, Prof. Rupert. — On the Forms of Silica, Geologically 



Considered. Prac. G-eolog. Assoc, vol iv. 

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Geologists' Association, vol. x., 1887, p. 79, pp. 217-226. 

 Langdale, Rev. H. Marmaduke. — Notes on the Structure of 



Kecent and Fossil Sponges. Chichester, 1888. 

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Geology of the S.B. of England. London, 1833. 

 Mortimer, R. — Flints of the Chalk of Yorkshire. Proc. Geol. 



Ass., vol. v.. No. 6. 

 Prestwich, Prof. J. — Geology, vol. ii., p. 320. 

 Ruskin, John. — On Banded and Brecciated Concretions and 



Formations. Geolog. Mag., vols, iv., v., vi., and vii., also 



Deucalion. 

 Sol las, Prof. W. J. — Afl&nities of the Genus Siphonia. Journ. 



Geol. Soc, xxxiii. The Flint Nodules of the Trimingham 



Chalk. Ann. and Mag. of Nat. Hist., vol. vi., 384. 

 Thompson, Sir Wyville. — The Depths of the Sea. London, 1873. 

 Wallich, Dr. — A Contribution to the Physical History of the 



Cretaceous Flints. Quart. Journ. Geol. Soc, Feb., 1880. 

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Journ. of Agric. Soc, vol. xiv., also vol. xxi. 

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p. 397. 

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p. 145. 



WEDNESDAY, JUNE 19th. 



ORDINARY MEETING. 

 "THE MINERALS OF THE CHALK," 



BY 



Mr. E. ALLOWAY PANKHUKST. 



