Living Plants and their Properties 



By J. C. Arthur and D. T. MacDougal 



A series of lectures on nutrition, irritability, and other fundamental subjects 

 in plant phj'siology. This is not a text-book, but is excellent matter for side 

 reading and should be in every educational institution and library. 



234 Pages, Illustrated Price, $1.2.=> 



Bibliography of Evaporation 



By Grace J. Livingston 



A complete bibliography of evaporation, embracing the literature of all lan- 

 guages from 1670 to 1908, with the titles arranged in chronological order. The 

 full and discriminating annotations accompanying each title form the most val- 

 uable feature of this work, especially to those who are interested in the bear- 

 ings of evaporation on agriculture, forestry, and plant and animal ecology. 



121 Pages Price, $1.25 



THE PLANT WORLD, TUCSON, ARIZONA 



The Vaporimeter 



Is an instrument for the measurement of evaporation, devised by Dr. E. N. 

 Transeau, of the Eastern Illinois State Normal School. The essfential feature 

 of the device is a slender, elongated cup. glazed over the lower half. Its in- 

 stallation is extremely simple, as no stopper and tub'ng are necessary, and 

 its successful performance recommends it for all classes of field and laboratory 

 use. For illustration and full description see Botanical Gazette, Vol. 49, pp. 

 459-460, June, 1910. 



Price, each $1.20 Per ten, $10.00 



The Non-Soluble Atmometer 



A new type of atmometer manufactured for us in Germanj- from carefully 

 purified materials, so as to contain practically no soluble matter of any kind. 

 The cup is somewhat smaller than the other types of atmometer which we 

 handle, and is glazed at the base for convenience in manipulation. This in- 

 strument is recommended for long series of readings in which re-standardization 

 is impractical, as well as for short series in which a high degree of accuracy is 

 required. 



Price, each $2.00 Per ten, $16.00 



THE PLANT WORLD, TUCSON, ARIZONA 



