SOO NOTICES OF AUTHORS. 



matter ; and this smaller quantity requiring to be 

 extended along a greater length of stem, the annual 

 rings are necessarily thinner. 



We admit that a tree becomes more stemmy by 

 being repeatedly pruned up ; — we admit, that, on 

 removal of the lower branches, the upper part of the 

 stem may have, for a few seasons, larger annual circles ; 

 but the annual circles mil be diminished in thick- 

 ness in a much greater proportion on the lower part 

 of the stem ; — we admit, that the timber, from being 

 deposited in a clean lengthened cylinder, becomes far 

 more useftd, there being less redundant matter than 

 when scattered out into stemmy branches, to which 

 disposition, trees in open situation sometimes in- 

 cline, especially if not transplanted very young, 

 but to which they are nevertheless much more dis- 

 posed under the common mode of pruning in an early 

 stage of their growth, than when left to themselves ; 

 — we admit, that trees, by pruning, raised to length- 

 ened stem, and thence performing less assimilation, 

 partly compensate for this less assimilation, for some 

 time, by making more stem deposit in proportion to 

 the other deposit, which extends the parts more im- 

 mediately necessary to new formation, — the roots 

 and twigs; but the deficiency of productory parts soon 



