Jn Demy 8vo., Cloth, pp. 250. Price 12]- (U.S.A. 3-50). 
AN INTRODUCTION TO THE STUDY OF THE 
DIATOMACGCE 
By FREDERICK WM. MILLS, F.R-M‘S., 
Author oft PE A —— to the Microscope,’ etc. 
By JULIEN DEBY, ER.MS. 
Lonpon : InirFeE & Son. N, 3, Ot od Street, Ludgate oe 
WASHINGTON, 1 P.C.: Tee Microscorr L PUBLISHING COMPANY, 
