AfPENDIX* 





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A Talk of the Specific Gravity of several sorts of Wood. 



Specific Gravity. Weight of a Cube Foot> 



Ib. 



Thorn, 87 - 54 



Crab-tree, 85 - 53 



Quince- tree, 83 51 



Mahogany, 82 51 



Plum-tree, 80 50 



Holly, 80- - 50 O 



Ash, 76 . - 47 S 



Barberry, 76 47 8 



Nut-tree, 76 47 8 



English oak, 75 46 14 



Beech, 74 46 4 



Elder, 73 - 45 10 



Pear-tree, 73 45 10 



Mulberry, 71 44 <J 



Walnut, 69 - - 43 2 



Yew, 67 - 41 



Maple, 63 41 



Yellow deal 63 - 39 



Cherry, 6l 38 



Norway oak, 6O 37 8 



Sallow, 5& S6 14 



Sycamore, 59 36 14 



Elm, 50 - 31 4 

 N. B. All the woods were very good of the sort, except the elm, 

 and ail very dry -, the measure is English, and the weight avoirdupoU. 



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No.VIIL 



