THE 



NATURE-STUDY 

 REVIEW 



DEVOTED PRIMARILY TO ALL SCIENTIFIC STUDIES OF NATURE IN 

 ELEMENTARY SCHOOLS 



OFFICIAL ORGAN OF 



AMERICAN NATURE-STUDY SOCIETY 



Vol. 7, No. 4 



WHOLE NO. 55 



CONTENTS 



April, 1911 



PAGE 



Organization in Course in Nature-Study. Otis W. Caldwfxl 87 



Studies of Aquatic Insects. L. S. Hawkins 91 



Studying the Echo. John T. Timmons 97 



Communication 99 



A Bird Tragedy ( Photo) 100 



Photographing Water Life. Thomas I. Miller 101 



The Bluebird. Florine M. Beckh art . . .. 103 



Farm Calendar. O. D. Center • 105 



Editorial 107 



Nature-Study News ....... 109 



Notes on Periodicals and Books 109 



Books Received no 



Timely References on Birds. Mrs. C. H. Robison 1 1 1 



Published Monthly except June, July and August by Fred L. Charles, Editor 

 URBANA, - - ILLINOIS 



$1.00 

 a VOLUME 



(9Nos.) 



15 



Cents 



Copy 



Entered as second-class matter February 7, 1910. at the post-office at Urbana, IlHnois, under the 



Act of March 3. 1879 



