. Canadian forest industries 1882. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. THE CANADA 41 during that period was 43 4-10th pounds to every square foot of surface, equal per acre of 43,560 feet, 1,890,504 pounds. From this it is clear that the amount of water by evaporation from an acre of woodland exceeded the quantity of rainfall during the same period by nearly 1,000,000 pounds of water to the same area, and, if the calculation had taken in fifteen hours to the day in July and August, as expiration goes on rapidly when the sun shines, the q
. Canadian forest industries 1882. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. THE CANADA 41 during that period was 43 4-10th pounds to every square foot of surface, equal per acre of 43,560 feet, 1,890,504 pounds. From this it is clear that the amount of water by evaporation from an acre of woodland exceeded the quantity of rainfall during the same period by nearly 1,000,000 pounds of water to the same area, and, if the calculation had taken in fifteen hours to the day in July and August, as expiration goes on rapidly when the sun shines, the quantity would have been much larger. Such experiments are of vast importance in determining the proportionate quantity of tim- ber to cleared land, in order to secure a sufficien- cy of rainfall during the summer. But this One, though valuable in proving one of nature's laws, is not of any definite practical importance as a means of guiding us in Ontario, since our loca- tion is different with regard to many important essentials, such as soil, proximity to ocean, ele- vation above sea level, and relative timber and cultivated surface; but such an experiment, carefully conducted, in any particular locality, and careful estimates based upon it, should be able to estimate pretty correctly what area of leaf surface would be required to insure a full crop under ordinary circumstances. {To he continued.]. Preserving Woods. That mortar is a preservative of wood is a fact well known, and many instances are noted of its value for this use. It has recently been stated that a schooner of unseasoned Maine timber, laden with lime, which went ashore and bilged forty years ago, was raised some time after and is still in service. Another in- stance is that of a platform, consisting of nine planks, which had been used successively by father, son and grandson for mixing mortar, was thrown aside, allowed to be overgrown with grass, and aftep-sixty years was resurrected, and found to be in a perfe
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