pjERE is one of the 

 most fasci n ati ng 

 nature books it has ever 

 been our good fortune 

 to publish : 



THE FROG BOOK 



By Mary C. Dicker son. 



Frogs and toads have been comparatively neglected in nature-study, but this 

 book contains a wealth of original observation and pioneer work that is a real con- 

 tribution to science. It is an ideal volume in the nature series we have long been 

 issuing — a work of reference which is authoritative and complete, yet full of vital 

 interest and as readable as " nature fiction." 



1 6 -plates in color and nearly joo black and white photo- 

 graphs from life by the author. Net, $4.00 {Postage, 34^^)' 



The easiest and pleasantest way to know the trees is through 



THE TREE BOOK 



By 'Julia E. Rogers. 



"This is the most valuable, accurate and elaborate book ever published in 

 America on our native X.xee.s.''—iVe'iv York Herald. 



The j^o beautiful photographic illustrations show bud, 

 blossom, full leaf, fruit and wood of all the important species. 

 16 plates in color. Net, $4.00 [Postage, J4c.) 



NATURE CALENDARS FOR 1907 



Series I. Bird Neighbors 

 Series II. Trees 



Considered merely from the standpoint of beauty, it would be difficult to find 

 any calendars so attractive as these. 



There is a colored plate of a bird, or a tree suitable to the particular season, 

 for each month in the year — together with a description of the species represented. 

 Typically American, they are ideal remembrances to send to friends who are abroad. 

 Price, each, ^1.50. 



DOUBLEDAY. PAGE & CO. NeW YORK. 



