Nolo ready. 
Published by Oi-at and Sons, Aye Maria Lane, 
CATALOGUE OF SCIENTIFIC PAPEKS, 
COMPILED BY THE ROYAL SOCIETT. 
Vol. 12 (Supplementary Volume, 1800-1883). Price:—Clotli, 25s. net.; Ealf-morocco, 32s. net. 
The hack volumes on sale as follows :—^Vols. 1-6 (1800-63), cloth (vol. 1 in half morocco) £4 net; half¬ 
morocco, £5 5s. net. Vols. 7, 8 (1864-73), cloth, £1 11s. 6d. net; half morocco, £2 5s. net. Single vols., 
cloth, 20s.; half morocco, 28s. net. Vols. 9, 10 and 11 (1874-83), cloth £1 5s. net; half-morocco, £1 12s. net. 
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, 
OBSEPYATIONS OF THE INTERNATIONAL POLAR EXPEDITIONS. 
1882-1883. 
FORT RAE. 
With 32 Lithographic Folding Plates. 
A reduction of price to Fellows of the Royal Society. 
Published by Kegan Paul, Trench, Trubner, and Co. 
A few copies at the reduced price of £1 Is. (published at £3). 
Royal 4to, pp. iv.—936, cloth. 
A MONOGRAPH OF THE HORNY SPONGES. 
By R. von LEKDEKFELD. 
With 51 Lithographic and Photographic Plates. 
A further reduction of price to Fellows of the Royal Society. 
Published by Kegan Paul, Trench, Trubner, and Co, 
In 1 vol., 4to. Pp. 500. With 6 Chromolithographs of the remarkable Sunsets of 1883 and 
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. 
Price 30s. To Fellows, 20s. 
Now Ready. Price 8s. 
Royal 4to. 112 pages with Map and Illustrations. 
MAGNETIC AND METEOROLOGICAL OBSERVATIONS 
MADE BY 
THE “SOUTHERN CROSS” ANTARCTIC EXPEDITION, 1898-1900. 
Under the Direction of C. E. Borchgrevink. 
Published by the Royal Society of London, and sold by Harrison and Sons, St. Martin’s Lane. 
Fellows of the Royal Society can obtain copies gratis, on application. 
