5i6 



PRODUCTION OF 



Sect. XVIII. 2. 2. 



\y efFeded by 



g them near each other ; as 



then th 



powerful contefl: with each other for Hght and air propels them up 



wards, inftead of producing many lateral branch 



may be fe 



many woods, which have not been too much thinned 



For th 



purpo 



f. 



fom 



h 



t) 



th 



pin 



planted trees of lefs value though of quicker 

 amongft oaks ; which may be pruned or lopped, 

 if they (hade the oaks too much, and may be finally removed, when 

 the oaks are crowded by them ; whence fmgle trees feldom grow fo 



thofe in woods, and appear ftunted 



called ; which 



fcribed to the cold feafons, or to their being expofed more 



to the wind 



, ; which may perhaps fometimes happe 

 therri climate ; or where trees are expofed to infalubr 



in 



th 



nor 



the fea 

 tains. 



ft 



in 



older fit 



the fum 



of moun 



Something fimilar to 



this may be {ecn in tuflbcks of grafs, or 



where too many feeds of wheat have been fown near together. The 

 central part of the knot of wheat or grafs grows much taller than the 



external part, fo as 



to give it a conical figure ; 



«3 



which has been by 



Ibme afcribed to the central part having been (heltered from the cold 

 by the external ring, but is more generally owing to the ftruggle of 



the internal ftems for the acquifition of light and air. 



The Society of Agriculture at Copenhagen has propofed prizes 

 concerning the cultivation of timber for (hip-building. One queftioa 

 is, whether the neceflary form and degree of flexion can by any means 



be given to growing timber without 



injuring 



it? 



This I 



imagine 



may be done by annually fcratching the external bark or cuticle ei~ 

 ther longitudinally or horizontally on the fouth fide of the part of a 

 tree, which is wi(hed to be curved,, as the fouth fide of trees are 

 known to grow fafter annually than the north fide, as is feen by the 

 greater thicknefs of the concentric rings of a tree, when felled and 

 fawed into blocks ; and becaufe the cuticle bounds the lateral crrowth 

 of the trunks of trees, as the (kin of animals bounds the growth of 



the 



-i 



