Hitherto the amount of gain is comparatively small, but this calculation continued according to the growth of the trees for ten years more, will leave the balance no less than 23,667_l._ And to the end of forty years from first planting, the round sum of 41,000_l._ “These calculations,” says Monteith, “may, to those who have paid no attention to the subject, excite wonder if not doubt, but in making them the author has been careful to lessen rather than exaggerate the profits: and if the plantation shall have been carried to the age of sixty or seventy years, and properly thinned, etc., the value will be double what it was at forty years.” Thus, if 100 acres in seventy years will yield 80,000_l._ planted with oak, 6000 acres will yield about 5,000,000_l._; while 6000 acres of the larch plantations of Athol in the same period are calculated to yield about 6,000,000_l._ There is sufficient agreement to lead us to suppose the calculations probably accurate, and what a splendid inducement to judicious planting do these calculations present! The following facts, given in the “Encyclopædia Britannica,” (vol. i., art. Agriculture), are also particularly interesting to the planter. Mr. Pavier, in the fourth volume of the Bath Papers, computes the value of fifty acres of oak timber in 100 years to be 12,100_l._, which is nearly 2_l._ 10_s._ annually per acre; and if we consider that this is continually accumulating, without any of that expense or risk to which annual crops are subject, it is probable that timber-planting may be accounted one of the most profitable departments of husbandry. Evelyn calculates the profit of 1000 acres of oak land in 150 years at no less than 670,000_l._ The following table shews the increase of trees from their first planting. It was taken from the Marquis of Lansdowne’s plantation, begun in the year 1765, and the calculation made in 1786. It is about six acres in extent, the soil partly a swampy meadow upon a gravelly bottom. The measures were taken at five feet above the surface of the ground; the small trees having been occasionally drawn for posts and rails, as well as rafters for cottages, and when peeled of the bark will stand well for seven years. Circumference in Feet in height. Feet. Inches. Lombardy Poplar 60 to 80 4 8 Abeel 50-70 4 6 Plane 50-60 3 6 Acacia 50-60 2 4 Elm 40-60 3 6 Chestnut 30-50 2 9 Weymouth Pine 30-50 2 5 Chester ditto 30-50 2 5 Scotch Fir 30-50 2 10 Spruce 30-50 2 2 Larch 50-60 3 10