THE 



CYCLOPAEDIA 



OF 



ANATOMY AND PHYSIOLOGY. 



EDITED BY 



ROBERT B. TODD, M.D. F.R.S. 



FELLOW OF THE ROYAL COLLEGE OF PHYSICIANS? 



PHYSICIAN TO KING'S COLLEGE HOSPITAL; AND FORMERLY 



PROFESSOR OF PHYSIOLOGY AND OF GENERAL AND MORBID ANATOMY IN KING'S COLLEGE, 



LONDON, ETC. ETC. 





VOL. IV. 



PLA 



WRI 



18471852 



LONDON 

 LONGMAN, BROWN, GREEN, LONGMANS, & HUBERTS. 



