* Diatomacee of North America, 
ILLUSTRATED WITH 
TWENTY-THREE HUNDRED FIGURES ON ONE HUNDRED 
AND TWELVE PLATES. 
BY REV. FRANCIS WOLLE, 
BETHLEHEM, PA. 
This work is now ready in one volume, cloth, uniform with 
the Author’s “ DESMIDS” and ‘‘ FRESH WATER ALG& ” of the 
United States. In it are collected from every available source, 
including rare and costly papers and volumes, references to all 
that has been written concerning the Diatoms of North America; 
and also drawings of all known forms, which are arranged in 
accordance with the most approved system of classification. . 
This edition, the only one that will be issued, is limited to 
four hundred copies. Price, SIX DOLLARS a copy, post-paid to 
any part of the United States. 
* —_———_+ + e+ —___——_ 
DESMIDS OF THE UNITED STATES. 
FRESH WATER ALG OF THE UNITED STATES. 
Very few copies of the first and a limited number of the 
second of these works, are all that remain unsold. No other 
editions of them will be published. 
Address all orders and remittances to 
REV. FRANCIS WOLLE, 
Bethlehem, Penna., U.S. A. 
