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In growth in the proportion of at leaft two to one. 

 I wifh fome of your ingenious correfpondents could 

 furnifh a rcgifler for the fucceeding 40 to 60 years: 

 but as the durability of human life is too little for 

 fuch records, and the fpirit of obfervation is feldom 

 tranfmitced fronn father to fon through many gene- 

 rations, we mull be content with reafoning from 



detached fads^ and this leads me to No. 8. 



I found -in my father's papers the two firft admea- 

 furements of this tree, and 1 have within a few days 

 taken that of the prefent date; by this it will appear 

 it has increafed rapidly and uniformly; and I need 

 not remark that, as it continues to increafe at the 

 rate of fomewhatmore than i^ inch yearly, it adds 

 every year a greater and greater quantity of timber, 

 in geometrical progrefTion ; and admitting that in 

 1768 it contained no feet of timber, in 1790 it 

 contains 2CO feet. I do not know that I am accurate 

 as to the real contents, but the relative proportions 

 are correvSt, which is all that applies to the prefent 

 argument. The increafe, which is 90 feet of tim- 

 ber, is wonderful for 22 years, and not to be 

 equalled, as I conceive, by any of the other kinds, 

 at any period of their growth; the difference be- 

 tween the poplars of No. i and 2 in 20 years was, 

 in the fame mode of eftimating them, only 39 feet 

 of timber each. But if, as in fadl No. 9 in addition 

 to this advantage, a crop can be obtained that will 



amply 



