MAR 7 1902 



New Series, No. 179 (Vol. 45, Part 3), 



Price 10s. 



^^sq 



FEBEUAEY, 1902. 



THE 



QUARTERLY JOURNAL 



MICROSCOPICAL SCIENCE, 



EUlTEIi HV 



E. RAY LANKESTEK, M.A., LL.D., F.R.S., 



HONORAUY FELLOW OF EXETER COLLEGE, OXl'ORD ; CORRESPONDENT OF THE INSTITUTE OF FRANCE 



AND OF THE IMPERIAL ACADEMY OK SCIENCES OP ST. FETEHSBURG, AND OF THE ACADEMY 



OF SCIENCES OF PHILADELPHIA; FOREIGN MEMDtiR OF THE ROYAL BOHEMIAN 



SOCIETY OF SCIENCES, AND OF THE ACADEMY OF THE LINCEI OF ROME; 



ASSOCIATE OF THE ROYAL ACADEMY OF BELGIUM; HONORARY MEMBER 



OF THE NEW YORK ACADEMY OF SCIENCES, AND OF THE 



CAMBRIDGE PHILOSOPHICAL SOCIETY, AND OF THE ROYAL 



PHYSICAL SOCIETY OF EDINBURGH ; HONORARY 



MEMBER OF THE BIOLOGICAL SOCIETY 



OF PARIs; 



DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS OF THE BRITISH MUSBUM; LATE FULLRRIAN 



PROFESSOR OF PHYSIOLOGY IN THE ROYAL INSTITUTION OF GREAT BRITAIN. 



WITH THE CO-OPEKATION OF 



ADAM SEDGWICK, M.A., F.R.S., 



FELLOW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE; 



W. F. R. WELDON, M.A., F.R.S., 



MNACKK PROIFSSOU OF COMPAK ATIVE AXATOMlf AND FEI.T.OW OF MEP.TOX COLLEGE, OXFOKO; 

 LATE FELLOW OF ST. JOHN's COLLEGE, CAMBRtDGE; 



AND 



SYDNEY J. HICKSON, M.A., F.R.S., 



BEVER rROlESSOR OF ZOOLOGY IX THE OWENS COLLEGE, MANCHESTER. 



WITH LITHOGRAPHIC PLATES AND ENGRAVINGS ON WOOD. 



LONDON : 



J. & A. CHURCHILL, 7, GREAT MARLBOROUGH STREET. 



1902. 



.\dlard and Son,] 



[Bavtlioloraew Ciose. 



