314 Forestry Quarterly. 



The place in which the plants are planted would undoubtedly 

 have a determining influence in the case of weakened plants, as 

 would also the weather conditions after planting but a con- 

 sideration of these is scarcely within the province of the present 

 investigations. As variables they may both be ignored in the 

 present instance. 



It is realized that these investigations are by no means com- 

 plete. From the scientific standpoint it was an error not to 

 have unexposed checks given otherwise the same treatment as 

 the exposed plants', though from the commercial standpoint it is 

 significant that some of the plants lived even after an exposure 

 of several hours. Merely two plants for each variable allowed 

 for, time of day, species, place of exposure, length of exposure, 

 is a small number but the reason has, it is believed, been satis- 

 factorily stated above. A recent article in "Forestry Quarterly" 

 (vol 12, p. 31) is based upon experiments along similar lines 

 started April 29th and kept under observation until the beginning 

 of August. Such extended study is desirable, but was imprac- 

 ticable in the present instance. Exposure immediately upon lift- 

 ing might work for more accurate results than the method used 

 (see infra.) 



The conduct of the experiment was as follows : 



The approximate number of plants of each species needed 

 was counted roughly in the bed and a double quantity dug, after 

 sunset, with the earth adhering to the roots, like a sod. These 

 sods were heeled in over night in the packing shed. The next 

 morning the requisite number of plants was taken, the original 

 earth shaken from the roots, and the exposures begun, the plants 

 being exposed on pine boards and held down against the wind by 

 a narrow strip of wood laid across the root collars and weighted 

 with rocks in such a way that no shade was cast upon the roots. 

 (A transplanting board might be more satisfactory, though it 

 would probably be more difficult to remove a few plants at a 

 time than in the case here described.) As before stated, the 

 plants were taken as they came, except that care was exercised 

 to use the ones near the center of the clump, and dead ones were 

 discarded. The exposures were thus begun, the Red pine being 

 started at 6.40, the White at 6.45. One group was left on the 



