272 Forestry Quarterly. 



of the wind. It was impossible to establish this relation during 

 the entire vegetative period, since, in order to do that, much 

 shorter intervals were required. 



(2) During the period of development of young shoots, the 

 loss of water in the pine does not go on parallel with the loss of 

 water from the evaporometer, especially in May and June. This 

 would indicate that physiological processes have more to do with 

 the loss of water from plants than meterological conditions. 



(3) During the day, the greatest loss of water by the pine 

 was observed in the morning and the forenoon hours. The 

 evaporometer lost most water in the afternoon hours. 



(4) The ratio between the loss of water by the pine and that 

 by the evaporometer is especially great during the months of 

 May and June. This period coincides with the vigorous growth 

 of young shoots and needles. 



(5) By comparing the loss of water from the pine with that 

 from the evaporometer for definite periods of time, it is possible 

 to determine converting co-efificients by means of which the in- 

 tensity of physiological activity of plants for different periods of 

 their development can be ascertained from the records of the 

 evaporometer. 



R. Z. 



Transactions of the Forest Experiment Stations, Vol. XLVII, 1913, St. 

 Petersburg. 



Prof. Albert, of Eberswalde, states that 

 Effect artificial fertilizers in pine forest did not 



of prove successful in Germany, while at- 



Cover tempts to substitute cultivation of forest 



Upon soil by covering with different vegetable 



Soil Moisture. refuse, such as lupine straw, tops of potato 

 plants, pine needles, gave favorable results. 

 He describes the results of moisture determination in the soil dur- 

 ing the summer of 191 1 in a poor forest stand near Eberswalde 

 on alluvial sand on three sample plots : ( i ) which was not culti- 

 vated at all; (2) cultivated in the spring and sown to lupine, 

 which, however, entirely disappeared; and (3) covered with pine 

 litter. 



Moisture determinations at a depth of 20 and 40 centimeters 

 clearly showed the effect of covering upon the greater humidity 

 of the soil during the entire year. 



