New Series, No. 165 (Vol. 42, Part 1). 



FEBRUARY, 1899. 



Price 10s. 



n 



THE 



QUARTERLY JOURNAL 



OP 



MICEOSCOPICAL SCIENCE. 



EDITKI) }iY 



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



J¥ THE NATURAL HISTOUY DEPAKTMENTS OF TUE BRITISH MUSEUM; HONORARY FELLOW ' 



(OLLEaK, OXFORD ; COR R KSPOXDI > G MEMBER OF THE IMPERIAL ACADEMY OF SCIENCES OF 

 PETERSBnRGr.AND OF THE ACADEMY OF SCIENCES OF PHILADELPHIA; FOREIGN MESIBER 

 \iV THE ROYAL BOHEMIAN SOCIETY OF SCIENCES, AND OF TU ■. ACADEMY OF THE LINCEI 

 OF ROME ; ASSOCIATE OP THE ROYAL ACADEMY OF BELGIUM; HONORARY MEMBER 

 OP THE NEW YORK ACADEMY, OF SCIENCES. AND OF THE CAMBRIDGE 

 PHILOSOPHICAL SOCIETY AND OF THE ROYAL PH YSICAL SOCI KT Y 

 OF EDINBURGH; HONORARY MEMBER OF THE BIOLO- 

 GICAL SOCIETY OF PARIS ; PULLERIA^' PROFESSOR 

 OF PHYSIOLOGY IN THE ROYAL INSTITU- 

 TION OF LONDON. 



WITH THE CO-OPERATION OF 



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



FELLOW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE; 



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



JODRBLL PH 



COLLEGE, LONDON; LATE 



WITH LITHOGRAPHIC PLATES AND ENGRAVINGS ON WOOD. 



LONDON ; 



& A. CHURCHILL, 7, GREAT MARLBOROUGH STREET. 

 -'""1899. 



.\dlard and Son,] 



[Bartholomew Close. 



