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Published by Clay and Sons, Aye Maria Lane, 
CATALOGUE OF SCIENTIFIC PAPERS, 
COMPILED BY THE ROYAL SOCIETY. 
Vol. 12 (Supplementary Volume, 1800-1883). Price:—Cloth, 26s. net.; half-morocco, 32s. net. 
The hack volumes on sale as follows:—Vols. 1-6 (1800-63), cloth (vol. 1 in half morocco) £4 net; half- 
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A reduction of price to Fellows of the Royal Society. 
Published by Kegan Paul, Trench, Trubner, and Co. 
Royal 4to, pp. xiv.—326, cloth. Price 21s. 
OBSERVATIONS OF THE INTERNATIONAL POLAR EXPEDITIONS. 
1882-1883. 
FORT RAE. 
With 32 Lithographic Folding Plates. 
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A few copies at the reduced price of £1 Is. (pubhshed at £3). 
Royal 4to, pp. iv.—936, cloth. 
A MONOGRAPH OF THE HORNY SPONGES. 
By R. von LENDEKFELD. 
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40 Maps and Diagrams. 
THE ERUPTION OF KRAKATOA AND SUBSEQUENT PHENOMENA. 
Report of the Krakatoa Committee of the Royal Society. 
Edited by G. J. SYMONS, F.R.S. 
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