32 



forestry Quarterly. 



wind (lying on the ground) for periods ranging from ten min- 

 utes to six hours and planted. The period of exposure was 

 stopped on the minute and the trees puddled for immediate plant- 

 ing with the planting board. The spacing was 4x4 inches and 

 the transplanted material received no subsequent cultivation or 

 watering although the weeds were kept out. The experiment 

 was carried out on April 4 and 5. The days were bright and 

 sunny: wind moderate S. W. (the nursery is surrounded on 

 west, south, and east by a fairly close stand of 60 ft. pitch pine) : 

 the temperature was about 72°F. : barometric reading 29.2 in.: 

 wet bulb thermometer 63° F. and dry bulb 71° F. (or relative 

 humidty 60%) at time of observation. After planting the wea- 

 ther remained clear for 5 days with the first rain on the 6th day ; 

 except for 15 days of very dry weather April 29th to May 14th. 

 The summer was rather wet and favorable to transplants. 

 The following are the results: 



While there is to be noted the expected variation between lots 

 in the different series, the data show the injury to become very 

 serious after a 40 minute exposure and all exposures from i^ 

 hours up resulted in less than half the stand which was secured 

 in the check plots. It must be borne in mind that this was full 

 exposure to sun and wind on the one hand, and on the other. 



