PREFACE 



begun in 1908. A complete list of the publications of the Botanical 



Survey follows : 



I. REPORTS OF THE SURVEY. 



Minnesota Metaspermae 1892: Conway MacMillan. 

 Minnesota Botanical Studies, volume I, parts 1-12, 1894-98. 

 Minnesota Plant Life 1899: Conway MacMillan. 

 Minnesota Botanical Studies, volume 2, parts 1-6, 1898-1902. 

 Minnesota Plant Diseases 1905 : Edward M. Freeman. 

 Minnesota Botanical Studies, volume 3, parts 1-3, 1903-04. 

 Minnesota Botanical Studies, volume 4, parts 1, 2, 1909- 

 Minnesota Algae 1910: Josephine Tilden. 

 Minnesota Trees and Shrubs 1912: 



II. MINNESOTA PLANT STUDIES. 



1. Guide to the Spring Flowers; F. E. Clements, C. O. Rosen- 



dahl, F. K. Butters. First edition, March 1908; second 

 edition, April, 1910. 



2. Guide to the Trees and Shrubs : F. E. Clements, C. O. 



Rosendahl, F. K. Butters. First edition, October, 1908 ; 

 second edition, September, 1910. 



3. Guide to the Ferns and Fern Allies, July, 1909: C. O. 



Rosendahl, F. K. Butters. 



4. Minnesota Mushrooms, September, 1910: F. E. Clements. 

 1 The Guide to Autumn Flowers has been printed in key form and 



used with classes for the past two years, but it has not been published 

 for distribution. The above publications of the Survey are sent upon 

 request to residents of Minnesota, and to the schools and colleges of the 

 State. They are also sent free to working botanists and botanical de- 

 partments and institutions upon the exchange list of the Survey. To 

 all others, the publications are for sale at the following prices : 

 Minnesota Plant Diseases (edition nearly exhausted), $2; Minne- 

 sota Algae, $1 ; Minnesota Trees and Shrubs, $1 ; Guides to Spring 

 Flowers, Trees and Shrubs, and Ferns, 10c. each; Minnesota Mush- 

 rooms, paper 50c, cloth $1. Minnesota Metaspermae and the first 

 three volumes of Minnesota Botanical Studies are sent for the cost of 

 transportation to those who can use these technical works. The edition 

 of Minnesota Plant Life is entirely out of print, but copies can still 

 be obtained from the New York dealers in second hand books. 



Frederic E. Clements, 

 Minnehaha-on-Ruxton, Head of the Department of 



Manitou, Colorado, Botany and State Botanist. 



July 31, 1912. 



