J^"^' 23 ]m 



New Series, No. CXXIX (Vol. XXXIII, Part 1). Price 10s. 



; "^ ^ I ' DECEMBER, 1891. ^ 



/ / /^^^ 



THE /--// 



QUARTERLY JOURNAL 



OF 



MICROSCOPICAL SCIENCE. 



EDITED BT 



E. RAY LA.NKESTER, M.A., LL.D., F.R.S., 



Honorary Fellow of Exeter College, Oxford. 



WITH THK CO-OPKRATION OK 



E. KLEIN, M.D., E.E.S., 



Lecturer on General Anatomy and Physiology in the Medical School of St. Bartholomew's Hospital, 



London ; 



ADAM SED&WICK, M.A., F.R.S., 



Fellow and Assistant-Lecturer of Trinity College, Cambridge ; 



A. MILNES MAESHALL, M.A., D.Sc, M.D., E.E.S., 



Late Fellow of St. JohtCs College, Cambridge; Professor in the Victoria University ; Beyer Professor of Zoology 

 in the Owens College, Manchester. 



WITH LITHOGRAPHIC PLATES AND ENGRAVINGS ON WOOD. 



LONDON: 



J. (fc A. CHUECHILL, 11, NEW BUELINGTON STEEET, 



MDCCCXCI. 



^ 



Adlard and Son,] [Bartholomew Close. 



