ears upon the
growth of trees. It is really a most curious document. I ought to
have thanked you sooner, but I was anxious, first, to compare your
Table with the result of my own admeasurements of trees at Court
Field in various situations; and give you, at the same time, the
result of my calculations.

"I find that my experience fully corroborates yours, though it
induces me to believe that the forest growth is slightly below an
average--which the soil and situation would also induce one to
imagine.

"I calculate, from your Table, that an oak-tree measuring 6 inches
girt doubles its contents (exclusive of its increase in height and
limb) in 5 to 6 years. Whereas, a tree measuring 8.5 inches, or half
a foot girt, requires 10 or 12 years to double itself.

"With regard to the trees 170 years old, I find that A has increased
19 feet or 28 per cent. only in 30 years, and B 26 feet or 48 per
cent. during the same period; neither, therefore, paying much
interest on their value within the last 30 years.

"I calculate that the value of the acres of growing timber which you
refer to (73 oaks averaging 58 feet) would be 624 pounds at 7 pounds
10s. per 50 feet; or, if the original value of the land and expense
of ploughing it amounted to 25 pounds, about twenty-five times its
original value.

"If the thinnings be considered equivalent to the expense of
protection-fences, &c., and 25 pounds at compound interest for 170
years be calculated, 624 pounds will be found to be less than 1/20
per cent. = a hundredth of 5 per cent. per annum.

"I remain, my dear Sir, very faithfully yours,

"JOHN V. VAUGHAN."

No. IV.
Mr. Wyrrall's Survey of the Forest of Dean Iron Works in 1635.

"_Canop Furnace_.--Most pt new built, the rest repaired by the Farmers,
22ft square, wheel 22ft diamr. Furnace box built 4 years since by the
Farmers. Bridge-house 48ft by 21, 9 high, built 4 years, Bellow's boards
18ft by 4. Clerk's house and stable built by the Farmers. A cottage
built by the Workmen belonging to the Works, now occupied by the Filler.
Built before the Farmers hired.--Founder's house, Minecracker's cabin, A
Mine Kiln.

"_Park Furnace_.--Same dimensions, repaired 4 years since by the Farmers,
Wheel and almost all the houses built by the Farmers.

"_Park end F