Articles of Special Interestto Botanists 
In THE MONIST, January 1906 $ .60 
HEREDITY AND THE ORIGIN OF SPECIES (Illustrated) 
By Daniel T. MacDougaL 
In THE MONIST, April 1906 ------ $ .60 . 
THE EXPERIMENTAL DATA OF THE MUTATION THEORY 
By J. Arthur Harris, Ph. D. 
In THE OPEN COURT, November 1906 - - $ .10 
BURBANKS PRODUCTION OF HORTICULTURAL NOVELTIES 
By Prof. Hugo De Vries. 
THE OPEN COURT, December 1906 $ .10 
Will contain A BIOGRAPHICAL SKETCH OF PROF. 
HUGO DE VRIES AND HIS WORK 
By Prof. H. Hus. 
These numbers will be supplied on receipt of price. 
The publishers of THE OPEN COURT and THE MONIST have 
in preparation a new work by Prof. Hugo De Vries entitled PLANT 
BREEDING: COMMENTS ON THE WORK OF NILSSON AND 
BURBANK, a popular and profusely illustrated work which is to be 
published January 1st at a popular price. 
THE OPEN COURT PUBLISHING CO. 1322 Wabash Ave., Chicago, U. S. A. 
THE BEST WORKS ON FERNS 
OUR FERNS IN THEIR HAUNTS, by Willard N. Clute. Octavo. 333 
pages. 225 illustrations. Eight colored plates. Contains the only il- 
lustrated key ever published, and a full account of all the ferns of 
Eastern America. The species can be identified by the illustrations, 
alone. More copies of this book are sold annually than of any other. 
Price post paid, $2.50. 
THE FERN ALLIES OF NORTH AMERICA, by Willard N. Clute. 
Octavo, 250 pages, 150 illustrations, eight colored plates. A companion 
volume to "Our Ferns in Their Haunts", containing a full account of the 
scouring rushes, club-mosses, quillworts, selaginellas, water-ferns, etc., 
etc., in North America. Seven key^ to the species. A check list with 
synonyms. The only bock on the subject in the English language. 
Listed in the New York State Library list among The Best Books of 
1905. Price post paid, $2.00. 
SPECIAL OFFERS — 
Either volume and a year's subscription to American Botanist. .. .$2.80 
Either volume and a full set of American Botanist, (10 volumes) . . . 6.00 
Both volumes to one address 3.80 
Both volumes and a year's subscription to American Botanist 4.50 
Both volumes and full set of American Botanist, (10 volumes) 7.75 
Address all orders to 
WILLARD N. CLUTE & CO., Joliet, Illinois 
