MAR 12 \ffii 



New Series, No. 184 (Vol. 46, Part 4) . 



^S'^M FEBEUAEY, 1903. 



Price 10s. 



THE 



QUARTERLY JOURNAL 



OF 



MICEOSCOPICAL SCIENCE. 



EDITED HY 



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



aONOUABY FELLOW OF KXETER COLLEGE, OXt^ORD ; CORRESPONDENT OF THE INSTITUTE OF FRANCE 



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



OF SCIENCES OF FHII, AUELPUIA ; FOREIGN MEMBER OF THE ROYAL BOHEMIAN 



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



AND OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES OF BOSTON ; 



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 MUSEUM; LATE FULLRRIAN 

 PROFESSOR OF PHYSIOLOGY IN THE ROYAL INSTITUTION OF GREAT BRITAIN. 



WITH THE CO-OPERATION OF 



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



FEI.I.OW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE; 



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



AND 



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



BEVEK PROFKSSOR OF ZOOI.OGV IN THE OWENS COLLEGE, MANCUE3TKB. 



WITH LITHOGRAPHIC PLATES AND ENGRAVINGS ON WOOD. 



LONDON : 



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



1903. 



Adlardand Son,] 



[London and Dorkin 



