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NOTICES OF AUTHORS. 



the ground at the surface, and the earth subse- 

 quently enlarged underneath as far as the congela- 

 tion proceeds, the roots below the congelation must 

 of necessity be drawn upwards to the distance which 

 the ground has swelled after the stem was fixed to 

 the surface. The earth, on thaw, first loses hold of 

 the plant at the surface, and then falls away as it 

 contracts. Each successive frost and thaw during 

 winter thus raises the plant a certain space, till by 

 spring it often is so far extracted, as to fall over on 

 its side. When the plant has stood a season, there 

 is generally a tuft of herbage around its stem, which 

 prevents the freezing in a considerable degree ; and 

 the roots having fixed in the lower earth, resist the 

 pulling up so much, that the hold which the frozen 

 earth has of the stem at the surface gives way, 

 sometimes pulling off a portion of the bark, and the 

 earth rises around the stem in place of pulling the 

 tree. 



Instead of the season for spring planting being 

 over by the middle of March, we think that, in 

 many of our wet moors, it should then only be com- 

 mencing, especially under the pitting system. How- 

 ever, planting should never be deferred a day later 

 in spring than what is absolutely necessary to ren- 

 der the ground sufficiently dry for the process. 



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