OCT 7 iQoi 



New Series, No. 177 (Vol. 46, Part 1). Price 10s. 



„ SEPTEMBER, 1901. 



THE 



QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



EDITED BY 



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



HONORARY FELLOW OF EXETER COLLEGE, OXFORD ; CORRESPONDENT OF THE INSTITUTE OF FRANC1-. 



AND OF THE IMPERIAL ACADEMY OF SCIENCES OF ST. PETERSBURG, AND OF THE ACADEMY 



OP SCIENCES OF PHILADELPHIA; FOREIGN MEMBER OF THE ROYAL BOHEMIAN 



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



ASSOCIATE OF THE ROYAL ACADEMY OP BELGIUM; HONORARY MEMBER 



OF THE NEW YORK ACADEMY OF SCIENCES, AND OF THE 



CAM BRIDGE PHILOSOPHICAL SOCIETY, AND OF THE ROYAL 



PHYSICAL SOCIETY OF EDINBURGH ; HONORARY 



MEMBER OF THE BIOLOGICAL SOCIETY 



OF PARts; 



DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS OF THE BRITISH MUSEUM; LATE FlILLEUIA^ 



PROFESSOR OF PHYSIOLOGY IN THE ROYAL INSTITUTION OF GREAT BRITAIN. 



WITH THE CO-OPERATION OF 



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



FELLOW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE; 



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



LINACKE PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MEP.TON COLLEGE, OXFORD^ 

 LATE FELLOW OF ST. JOUn's COLLEGE, CAMBRIDGE; 



AND 



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



BETER PROFESSOR OF ZOOLOGY IN TUE OWENS COLLEGE, MANCHESTER. 



WITH LITHOGRAPHIC PLATES AND ENGRAVIKGS ON WOOD. 



"LONDON : 



& A. CHURCHILL, 7, GREAT MARLBOROUGH STREET. 



1901. 



.\dlard and Son,] 



[Bartholomew Close. 



