KODAK FINISHING 



We Guarantee to get the best possible results from your 



exposures. Mail orders attended to promptly. 



Catalogue and Price List Free 



The Smith Sporting Goods Company 



TUCSON. ARIZONA 



UNIVERSITY OF COLORADO MOUNTAIN LABORATORY 



The eighth annual session will be held at Tolland, Colorado (altitude 

 8,889 feet), from June 26 to August 5, 1916. Work is offered in zoology 

 and botany, chiefly ecological. Most of those who attend are graduate 

 students or instructors in high schools or colleges. For catalogue address 

 the professor in charge, 



DR. FRANCIS RAMALEY, 



University of Colorado, Boulder, Colorado 



LARGE AUTO-IRRIGATORS 



For the automatic watering of large pots or beds of soil we offer an Auto- 

 Irrigator Cup which is similar to the ordinary Atmometer in its form and 

 proportions, but is 14 inches in length and \\ inches in diameter. These 

 large cups are installed and operated in the same manner as the smaller 

 Auto-Irrigators which are now in general use, and also lend themselves 

 to various other purposes. 



Directions for the use of Auto-Irrigators will be sen€ on request. 

 THE PLANT WORLD - - Tucson, Arizona 



EFFICIENCY 



The Principles of Scientific Shop Management are Applied by us to the 



Printing Business 



We manufacture this Journal. In addition vre produce 25 other scientific and technical 



publtcattons and a large number of books and catalogues. 



All are handled on a itiinit* tchtiul* maintaining the highest standard of mechanical 



workmanship. 



WAVERLY PRESS 



WILLIAMS & WILKINS COMPANY 2419-2431 Greenmount Atc, Baltimore. Md., U. S. A. 



