New Series, No, 196 (Vol. 49, Part 4). Price 10s, net. 
os Q°| FEBRUARY, 1906 
THE 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL. SCIENCE. 
BY 
EDLTED 
H, RAY LANKESTER, M.A., D.Sc., LL.D., F.R.S.; 
HONORARY FELLOW OF EXETER COLLEGE, OXFORD} CURRKSPONDENT OF THE INSTITUTE OF FRANCK 
AND OF THE IMPERIAL ACADEMY OF SCIENCES OF ST. PETERSBURG, AND OF THE ACADEMY 
OF SCIENCES OF PHILADELPHIA, AND OF THE ROYAL ACADEMY OF SCIENCES 
OF TURIN; FOREIGN MEMBER OF THE ROYAL SOCIETY OF SCIENCES OF 
GOTTINGEN AND OF THE KUYAL BOHEMIAN SOCIRTY OF SCIENCES, AND 
OF THE ACADEMY OF THE LINCEI OF ROMER, AND OF THK AMERICAN 
ACADEMY OF ARTS AND SCIENCES OF BOSTON: ASSOCIATE OF THE 
ROYAL ACADEMY OF BELGIUM: HONORARY MEMBER ©F THE 
NEW YORK ACADEMY OF SCIENCES, AND OF THE 
CAMBRIDGE PHILOSOPUICAL SOCIETY, AND OF 
THE ROYAL PHYSICAL SOCIETY OF EDIN- 
BURGH ; HONORARY MEMBER OF THE 
BIOLOGICAL, SOCIETY OF PARIS; 
FOREIGN ASSOCIATE OF THE NATIONAL ACADEMY OF SCIENCES, U-S., AND MEMBER OF 
THE AMERICAN PHILOSOPHICAL SOCIETY 4 
DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS OF THE BRITISH MUSEUM, LATE FULLERIAN 
PROFESSOR OF PHYSIOLOGY IN THE ROYAT, INSTITUTION OF GREAT BRITAIN; 
LATE LINACRE PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLEGE, OXFORD. 
WITH THE CO-OPERATION OF 
ADAM SEDGWICK, M.A., F.RS., 
FELLOW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE 3 
W. F. R. WELDON, M.A., F.B.S., 
LINACKR PROFESSOR OF COMPARATIVE ANATOMY AND FELLOW OF MERTON COLLEGK, OXFORD; 
LATE FELLOW OF ST. JOHN’S COLLEGR, CAMBRIDGE 3 
AND 
Be ONnY J. HICKSON, MA.) E.R:S., 
BEYER PROFESSOR OF ZOOLOGY IN THE OWENS COLLEGE, MANCHESTER, 
WITH LITHOGRAPHIC PLATES AND TEXT-FIGURES. 
AT OND ON; 
J. & A. CHURCHILL, 7 GREAT MARLBOROUGH STREET. 
1906. 
Adlard and Son, Irvr.,] [London and Dorking, 
