QUARTERLY JOURNAL 



MICROSCOPICAL SCIENCE. 



EDITED BY 



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



DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS OF TUE BRITISH MUSEUM ; HONORARY FELLOW OF EXETER fuLLEGE 



oxford; CORRESPONDING MEMBER OF THE IMPERIAL ACADEMY OF SCIENCES OF ST. P ETE R SBUR G, AN D OF THE 



ACADEMY OF SCIENCES OF PHILADELPHIA; FOREIGN MEMBER OF THE ROYAL BOHEMIAN SOCIETY OF 



SCIENCES, AND OF THE ACADEMY OF THE LINCEI OF ROME; ASSOCIATE OF THE ROYAL ACADEMY 



OP BELGIUM; HONORARY MEMBER OF THE NEW YORK ACADEMY OF SCIENCES, AND OF 



THE CAMBRIDGE PHILOSOPHICAL SOCIETY AND OF THE ROYAL F HYSICAL SOCIETY 



OF EDINBURGH; ASSOCIATE MEMBER OF THE BIOLOGICAL SOCIETY 



OF PARIS ; FULLERIAN PROFESSOR OF PHYSIOLOGY IN THE 



ROYAL INSTITUTION OF LONDON. 



WITH THE CO-OPEKATION OF 



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



FELLOW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE; 

 AND 



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



VOLUME 4L— Nkw 8k\uks. 



LONDON: 

 J, & A. CHURCtiILL, 7, GREAT MARLBOROUGfl STREET. 



■ 1899. 



