158 



EVAPORATION OF WATER THROUGH PLANTS. 



In some trials and measurements reported in the Louisiana Planter 

 to have been made at Utah Agricultural Experiment Station, it was 

 found that clover evaporated water equivalent to a rainfall of 29f 

 inches, and that corn mealies evaporated 25 inches. These quantities 

 being collected by the roots from the soil and subsoil, and evaporated 

 through the leaves. 



'^Professor Heffriegel estimated that 330 tons (sixty-six thousand 

 gallons) of water are absorbed by t he roots of clover, drawn up through 

 the stems and evaporated through the leaves for each ton of clover 

 harvested. Referring to alfalfa (lucerne), it is stated that it is not un- 

 usual to irrigate alfalfa every two weeks and to spread an amount of 

 water over its surface during the period of its growth equal to a depth 

 of 6 feet. A portion of this water sinks into the subsoil and may flow 

 off as seepage water ; the second part is evaporated and the remainder, 

 perhaps one-third of the whole, passes through the tissues of the 

 plant and is mostly transformed into vapour at the leaves." 



It is well to remember that weeds absorb water from the soil as well 

 as the plants of the cultivated crop, thus not only choking them, but 

 wasting the moisture of the soil as well. 



ADDITIONS AND CONTRIBUTIONS TO THE 

 DEPARTMENT. 



Library. 

 Europe. 



British Isles. 



Botanical Magazine, August. [Purchased.] 



British Museum, Annual Return for 1899. [Trustees.] 



British Trade Journal, August. [Editor.] 



Chemist and Druggist, July 28, (Summer Issue) Aug. 4, 11, 18. [Editor.] 



Garden, July 28. Aug. 4, 11, 18. [Purchased.] 



Gardeners' Chronicle, July 28. Aug. 4, 11, 18. [Purchased,] 



International Sugar Journal, August. [Editor.] 



Journal of Botany, August. [Purchased.] 



Journal R. Horticultural Society, August. 



Nature, July 26. Aug. 2, 9, 16. [Purchased.] 



Pharmaceutical Journal, July 28. Aug 4, 11, 18. [Editor.] 



Produce World, Aug. 3. [Editor.] 



Sugar, August. [Editor.] 



The School World, June, July, August. [Publishers,] 

 West Indian and Commercial Advertiser, Aug. [Editor.] 



France. 



Sucrerie indigene et coloniale. July 24, 31. Aug., 7, 14, 21. [Editor.] 



Qermany. 



Tropenflanzer, August. [Editor.] 



Index Lectionum in Lyceo Regio Hosiano Brunsbergensi. [Dr. I. Urban.] 



Asia. 



India 



Planting Opinion, July, 7, 14, 21, 28. [Editor.] 



