The IRISH NATURALIST for 1921 (twelve parts) will be sent to any Address 

 foT lOs. Subscriptions should be sent to Messrs. Eason and Son, Ltd., 40 Lower 

 Sackville Street, Dublin. Single Copies, Is. each. 



NATURE. 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 

 PRICE ONE SHILLING. 



I 1 



" NATURE " contains Original Articles on all subjects coming within 

 the domain of Science, contiibuied by the most eminent scientific writers 

 of the day. It also contains Reviews of all recent scientific works ; 

 Correspondence Columns, which form a medium of scientific discussion 

 and of intercommunication among men of Science ; Reports of the 

 Proceedings of the Principal Scientific Societies and Academies of the 

 World ; and Notes on ail matters of current scientific interest 



SUBSCRIPTIONS TO "NATURE." 



£ 8. d. {To all places Abroad) £ a. d 



Yearly ... ... 2 12 0 Yearly ... ... 2 17 0 



Half-yearly ... 16 0 Half- Yearly ... ... 1 10 0 



Quarterly ... ... 0 13 0 Quarterly ... ... 0 16 0 



A charjje of Sixpence is made for changing Scotch and Irish Cheques. 



Cheques and Money Orders to be made payable to Macmillan & Co., Ltd., St. 

 Martin's-st., London, W.C.2. 



THE NATURALIST. 



A Monthly Illustrated Journal oj 



NATURAL HISTORY FOR THE NORTH OF ENGLAND. 



EDITED BY 



T. SHEPPARD. M.Sc, F.G.S.. F.R.G.S.. F.S.A., Scot., 

 The Museum, Hull ; 



AND 



T. W. WOODHEAD, Pli.D., M.Sc, F.L.S., Tech. Coll., 



HUDDERSFIELD. 

 WITH THB ASSISTANCE AS RBFERBBS IN SPBCIAL DBPABTMBNTS OF 



6E0. T. PORRITT, F.L.S., F.E.S. RILEY FORTUNE, FJE.S. 



JOHN W. TAYLOR, M.Sc. 



This Journal is one of the oldest Scientific Periodicals in the British Isles dating back to 1833. 



London : A. BROWN & SONS. Ltd., 5. FARRINGDON AVENUE, E.G. 

 Prepaid Subscription, 10/6 per annum, post free. 



Communications to be addressed to the Editors of the Naturalist, The Museum, Hul . 



