THE MONTHLY 
MICKOSCOPICAL JOUKNAL 
TEANSACTIONS 
OP THE 
ROYAL MICROSCOPICAL SOCIETY, 
AND 
RECORD OF HISTOLOGICAL RESEARCH 
AT HOME AND ABROAD. 
EDITED BY 
HENEY LAWSON, M.D., M.E.C.P, F.RM.S, 
Assistant Physician to, and Lecturer on Physiology in, St. Maryh HospitaL 
VOLUME XIIL 
L 0 N D 0 : 
EGBERT HAEDWIGKE, 192, PICCADILLY, W. 
MDOCCLXXV, 
