TRACTS ON VARIOUS SUBJECTS, &c. 63 



however, cut off <;Iose to the crowns, and the whole, after being- 

 pruned of the small fibres, weiiijhed 1196 pounds. 



As the roots of the experiment lots were not separately weighed, 

 I deduce their respective produce in the following manner. 



As the total weight of the leaves. 



Is to the total weight of the roots ; 



So is the weight of the leaves from each experiment, 



To its proportion of the roots. Then, 



lbs. 



257 no manure. 



554 J Hog's dung and ashes 



384^ Guana, or sea-fowl dung. 



These results being reduced to acreable produce, in the same 

 manner as the leaves in the preceding Table, will be as follows ; 



No manure, 257lbs. x 167th = 42919lbs. or 19^ tons of roots 

 per acre. 



Hog's dung and ashes, 554ilbs. x 269th = 1491601bs. or 66^ 

 tons of roots per acre. 



Guana, or sea-fowl dung, 384|^lbs. x 454th = 1 745631 bs. or 77| 

 tons of roots per acre. 



Now, the acreable produce in leaves and roots from each ex- 

 periment will stand thus ; 



Leaves Roots ^b^a/ acreable 



] ~ 7~ Produce of the 



Acreable Acreable ;„„ „ ' , ,„ 



T> 1 n 1 „» leaves Is roots. 



Produce. Produce. ' 



No manure - - 38 tons -|- 19^ tons=^ 57^ tons 



Hog's dung and ashes 131 ^m^ =197i 



Guana, or sea-fowl dung ]53| +77| =231 



These results are manifest proofs of the great benefit of ma- 

 nuring the lands They likewise shew the surprising efiiect of the 

 Guana, from which it may be inferred, that 35 bushels of this 

 manure are equivalent to 35 loads of hog's dung and ashes ; or, 



