The Gardeners' Chronicle and Agricultural Gazette . ch at the same point on a circular surface,?to count a certain number of annual layers which we mea-?sure. ^Ve then find the annual growth of those trees?which have left off growing in height, by the formula|4 3 (D — d) V ^-pj ?; and for those which continue to grow in HsKbytheformuir^W^rl^ ,i„whi;hD= lam of tree, V=the volume of the same, (? the thicknesst the annual layers which have been counted, and ntie Bumber of these layers. These formula depend upon lt> J ^™^ • ^^ ^^ ^°° <? cylinders of the sameutitndeare to one another as the s
The Gardeners' Chronicle and Agricultural Gazette . ch at the same point on a circular surface,?to count a certain number of annual layers which we mea-?sure. ^Ve then find the annual growth of those trees?which have left off growing in height, by the formula|4 3 (D — d) V ^-pj ?; and for those which continue to grow in HsKbytheformuir^W^rl^ ,i„whi;hD= lam of tree, V=the volume of the same, (? the thicknesst the annual layers which have been counted, and ntie Bumber of these layers. These formula depend upon lt> J ^™^ • ^^ ^^ ^°° <? cylinders of the sameutitndeare to one another as the squares of their dia- eters; 2d, that similar cones or cylinders are to one ?notber as the cubes of their diameters. In fact, calling tiie number of layers,whose volume is = C, we have two foportions, viz., V: C:: D^ : D—(D —2(iV, and ? r = = D : D— (D — 2df ; whence we have ^idJD-d)y andC- (D^-(D-2d)3) V lUviding this total growth of layers by n, we have the^OBthof one year. The formulse are correct, if we ?TMi, v. Brazilian Trees, ;)Ed to be older than the era op Our Saviour. it up to 4104 ; fromwhicli he concludestl at the trees cannotbut date far beyond thetime of our Saviour. While, however, thenumber of concentriczones is admissible aseMclence of the age oftrees growing in coun-tries where a total sus-pension of growthtakes place on the ap-I roach of winter, it isloubtful whether theyare safe guides for thetiees of hot the contrary it isprobable that in theEast Indies trees willproduce more thaneven two rings ofwood annually. Wehave seen as manyas four in what wewere assured wereone-year-old branches,produced near Cal-cutta. And if BO, allsuch calculations asth te we have alludedto fall to the ground. Is there no tropicalbotanist who will takethe trouble of deter-mining such a pointas tills? We are surethat the knowledgeof the inquiry beingwanted will at onceinduce them to insti-tute it; and we trustthey wOl make ourcolumns the mediu
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Keywords: ., bookcentury1800, bookdecade1840, bookidg, booksubjecthorticulture
