THE MONTHLY 
MICROSCOPICAL JOURNAL : 
TRANSACTIONS 
OF THE 
ROYAL MICROSCOPICAL SOCIETY, 
AND 
RECORD OF HISTOLOGICAL RESEARCH 
AT HOME AND ABROAD. 
EDITED BY 
HENRY LAWSON, M.D., M.R.C.P., F.R.M.S., 
Assistant Physician to , and Lecturer on Physiology in, St. Mary's Hospital. 
VOLUME XIII. 
LONDON: 
ROBERT HARDWICKE, 192, PICCADILLY, W. 
MDCCCLXXV. 
