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SPECIAL REPORTS ON THE MINERAL RESOURCES 

 OF GREAT BRITAIN, 



just issued by the Board of Agriculture and Fisheries, of which a second 

 edition of the second volume on the Mineral Eesources of Great Britain 

 has been prepared by the Director of the Geological Survey in response 

 to numerous inquiries that have arisen through the conditions brought 

 about by the War. 



In the main, it is a reprint of the first edition, wherein the uses, 

 distribution, treatment, and output of Barytes and Witherite are dealt 

 with, and particulars of the mines, active and inactive, are given. 

 Price 2s. net. These volumes have been already noticed in the Geological 

 Magazine for 1916. 



Copies may be obtained from Messrs. Dulau & Co., or from 

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JUST ISSUED. 



Catalogue of Secondhand BOTANICAL and NATURAL 

 HISTORY BOOKS. Sent free to any address on application. 



PALjEONTOGRAPHICAL SOCIETY, 1915. 



VOLUME LXIX. £1 Ss. 



CONTAINING : 



1. The Wealden and Purbeck Fishes. Parti. By Dr. A. S. WOODWARD. Ten plates. 



2. The Palaeozoic Asterozoa. Part II. By Mr. W. K. Spencer. Four plates. 



RAY SOCIETY. 



WORSDELL (W.C). The Principles of Plant Teratology. 



2 vols. 8vo. With 50 plates. Cloth. £2 10s. net. 



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