The ingenious Dr. Nooth, of Quebec, who is at the head of the general hospital in Canada, has made a variety of experiments upon the manufacture of maple sugar; he has granulated, and also refined it, so as to render it equal to the best lump sugar that is made in England. To convince the Canadians also, who are as incredulous on some points as they are credulous on others, that it was really maple sugar which they saw thus refined, he has contrived to leave large lumps, exhibiting the sugar in its different stages towards refinement, the lower part of the lumps being left hard, similar to the common cakes, the middle part granulated, and the upper part refined. [Sidenote: MAPLE TREES.] Dr. Nooth has calculated, that the sale of the molasses alone would be fully adequate to the expence of refining the maple sugar, if a manufactory for that purpose were established. Some attempts have been made to establish one of the kind at Quebec, but they have never succeeded, as the persons by whom they were made were adventurers that had not sufficient capitals for such an undertaking. It ought not, however, to be concluded from this, that a manufactory of the sort would not succeed if conducted by judicious persons that had ample funds for the business; on the contrary, it is highly probable that it would answer. There is great reason also to suppose, that a manufactory for making the sugar from the beginning, as well as for refining it, might be established with advantage. Several acres together are often met with in Canada, entirely covered with maple trees alone; but the trees are most usually found growing mixed with others, in the proportion of from thirty to fifty maple trees to every acre. Thousands and thousands of acres might be procured, within a very short distance of the River St. Lawrence, for less than one shilling an acre, on each of which thirty maple trees would be found; but supposing that only twenty-five trees were found on each acre, then on a track of five thousand acres, supposing each tree to produce five pounds of sugar, 5,580 cwt. 2 qrs. 12 lbs. of sugar might be made annually. The maple tree attains a growth sufficient for yielding five pounds of sugar annually in the space of twenty years; as the oaks and other kinds of trees, therefore, were cut away for different purposes, maples might be planted in their room, which would be ready to be tapped by the time that the old maple trees failed. Moreover, if these trees were planted out in rows regularly, the trouble of collecting the sap from them would be much less than if they stood widely scattered, as they do in their natural state, and of course the expence of making the sugar would be considerably lessened. Added to this, if young maples were constantly set out in place of the other trees, as they were cut down, the estate, at the end of twenty years, would yield ten times as much sugar as it did originally. [Sidenote: MAPLE SUGAR.]