THE 



RADIO-ATMOMETER 



Is a black-brown form of the white Atmometer, already 

 widely known. The manner in which it may be used 

 in conjunction with the white Atmometer in studies of 

 light intensity has been described b}' the devisor, Prof. 

 B. E. Livingston, in the following papers: 



The Plant Worlds vol. 14, pp. 96-99, May, 191 1. 



The Botanical Gazette, vol. 52, pp. 418-438, December, 1911. 



These black-brown cups can now be supplied in the natural 

 state at $1.00 each; $8.00 per 10. 



THE PLANT WORLD 



TUCSON ARIZONA 



THE F. RONSTADT CO. 



TUCSON - - ARIZONA 



AGENTS FOR 



PLANET JR. GARDEN TOOLS, IMPLEMENTS, PUMPS 

 ENGINES AND WINDMILLS 



THIS Catalog contains a volume of information regard- 

 ing Trees and Plants for Rock Gardens, Old Fashioned 

 Gardens, Sea Shore Planting and Ground Covering 

 V under Rhododendrons and Shrubbery. Gives also sugges- 

 '^'^B^K'; \ tive planting plans and planting lists for Rose Gardens, 

 J^^^ \ \ Herbaceous Gardens and Suburban Estates. Names and 

 describes desirable Trees and Shrubs with Ornamental 

 Fruits, Hedge Plants. Trees for Orchard and Forest Plant- 

 ing, new and old varieties of Roses and Climbing Vines. 

 Copy sent Free upon request. 

 We grow in quantity every hardy tree or plant worthy of cultivation. 

 Correspondence invited. 



Dept. 



THE NEW ENGLAND NURSERIES CO. 



'H." BEDFORD, MASS. 



