An experiment made here, with salt, in potato culture, may be useful to record: It has been contended that common salt, both was, and was not, valuable to the growth of this crop. I experimented somewhat largely, and offer the results:

Upon 100 sets, I placed directly in the hole, when planting, a gill of common salt, which killed about fifty per cent. To another 100 sets half a gill; all came up and grew. Upon another 100 sets none; the tubers and haulm showed no observable difference among the different lots. To another 100 sets that were periment I would remark that flat hoeing, and not hilling up, is far preferable for this, and all other crops requiring regular moisture at the roots; indeed,it is one of the most mistaken dogmas of the age, that garden beds arc universally made high, and curved, or rounded on the surface, and the paths or walks left sunken, when in truth, the reverse should be the case. Our summer showers are few and far between, and should be carefully caught upon the spot where they fall, instead of allowing them to wash the surface of its fertility, to be carried by the paths to some neighboring brook, or, perchance, enrich some neighbor's low land. In evidence of this, I would adduce the fact, well known to observing persons, that the soil under a tree of ten or more inches in girth, is never moistened beyond a few inches in depth, from the middle of May to September, that is from the opened leaf to the fall rains. Is it not reasonable then, that in our climate we have no spare moisture.

Did I dare offer an immature opinion, I should attribute to this fact the blight of pear trees, etc. In the observations I have made, the trees thus affected have in all cases been in a light porous or shallow worked soil, and affected at a time when evaporation is at its greatest point, the roots having exhausted the surrounding moisture in greater ratio than the supply. In deep and well trenched soil, with a suitable mulch, I have never yet seen a blight.

Pear seedlings in our neighborhood arc generally considered a failure, losing their foliage early and suffering greatly from blight - while mine, on the contrary, grown on subsoiled land, well dressed with ashes, hair and scoriae have flourished finely, ripening well their wood, and had not, up to the 5th of December shed their leaves. They were then covered by a heavy fall of snow. Of several hundred pears from the yearling to the bearing, which I plant-ted early in the spring in similarly prepared land, each having a mulch of spent tan, not an instance of blight has occurred; while a.neighbor is deeply sorrowing the loss of forty beautiful trees. It may, I feel assured, be a settled axiom, that the pear can not be successfuly

Vegetable physiology fully demonstrates this, and from it we may learn that all high bred and hybrid plants require a greater degree of care in their culture, which includes both food and pruning. In especial evidence we might adduce the foreign grape, the strawberry, and the modern pear, which, under the manage-ment of different individuals, even in the same locality, show as great dissimilitude as it is possible to conceive.

While on the subject of pears, may I ask you, or your correspondents to settle the disputed question of legitimate Quince stocks - must they as a sine qua non, be of the Angers, upright, pear, Portugal or orange variety? Pray clear up this matter - as I design to plant yet some two thousand more dwarfs, 1 feel some interest in the solution.

A portion of my plantation consists of an hundred cherries, mostly beginning to bear; and also an acre of strawberries, among which, are the famous Scheneike seedlings.

Peaches in our locale, in open position, are a doubtful crop, and yet in many of our city gardens - warm, and sheltered, fine specimens are annually grown. Having a soil peculiarly adapted to the peach (an old sod sandy loam on a limestone rock) and elevated beyond any adjacent point for several miles, I have thought it worth the experiment, to plant seventy-five trees, of the hardy varieties; selecting those on plum stocks, as vastly better suited to our climate, aside from the protection by this means, from the peach worm. Ashes, lime and hair are my specific fertilizers for this fruit - I give a shovel full of each, well incorporated in the hole, with an additional shovel full of ashes and charcoal as a top dressing, and finish by raising a mound a foot high as a stay for winter blasts, and the depredations of field mice.

How unfortunate it is that nurserymen in packing this tree, so perfectly denude them of their lower branches; these, to me, constitute their best portions, to renew which, requires severe heading back. The peach to be success-full, should be kept low, and bush like. They notwithstanding the hue and cry about the curculio. In this matter I have had some experience, and with all due deference to the "instincts" your correspondents so kindly speak of, I claim to have the secret of success! For ten years, I have tried with faithful care, the various recipes promulged, such as sulphur, salting, picking up, dung heaps, strong odors, and lastly manipulation (the grand secret,) viz: catching all the he ones and shortening the proboscis. From half a dozen trees, planted fifteen years ago, full half a mile from any other, and yearly loaded with fruit to be consigned to the piggery, I have by my method, for several seasons past, obtained annually, fifteen bushels of perfect fruit. That this insect is migratory, and fleet of wing, there can be no doubt, and neither is their presence confined to plum trees. I have found them in the woods in great abundance, on the Manitou Islands in Lake Michigan, and other places where no plums are to be found.

The paving process is a failure, the trees to over-hang water an absurdity-and although catching them may seem a "puttering" job, let me assure you it is a safe one, productive of much fruit. My method has been from the setting of the blossom, to spread sheets under the tree, and jar and shake, with a properly arranged hooked pole. This should be done early in the morning about sunrise, and continued at frequent intervals, say three or four times per week, until the fruit is ripening, when instinct tells the creature (should there be any left) that it is too late to penetrate the pit. To induce watchfulness I have paid a penny each, and frequently have they been captured in the act of puncturing the fruit. Occasionally from forty to fifty were caught per day, and yet even at these prices I have been the gainer, as the fruit, from the general scarcity, would readily command from three to four dollars per bushel.

Hedging in this vicinity is almost unknown, if we except the Privet, which is only suitable to define paths, or form screens around buildings.

And the attacks of animals and insects. These arc highly important considerations - and to me peculiarly so. At the present I am trenching for three hundred rods of hedge. The Osage Orange is my favorite, hut I fear its durability for that purpose in our neighborhood. Of several hundred plants which I grew from seed, and bestowed upon friends in this vicinity, I find them, as also my own, more or less winter killed when unprotected, besides being subject to girdling by field mice, of which we hare more than a share. It makes, however, the most beautiful hedges, in every point of view, far handsomer where it flourishes, than England's Hawthorn, which fades under our bright sun. The Berberry has been highly spoken of for hedging, but not having seen either hedge or testimony, sufficiently satisfactory, I remain in doubt. A side nurseryman last year advertised largely, a stock of this plant for hedging, but sending an order at once, for a thousand plants, they were ail just gone!

Some years since, I induced a friend to try the Indigenous thorn so common in our woods. Nearly half a mile of hedge was made, and does pretty well, but due care was not taken in selecting the plants sufficiently small. The larger ones being stunted by transplanting, gaps were made difficult to repair. Thus, after all that has been written on the subject, safety seems confined alone to the Buckthorn. Your own testimony has resolved me to plant largely of it. I had feared that animals would browse upon it, but you say, vol. 1, p. 848, "its leaf and bark are offensive to insects, and the borer will not touch it", which I trust may be extended to graminivorous animals.

A thoroughly protective hedge, or an uncouth looking strong fence, is absolutely necessary to the orchards, if he may derive either pleasure or profit from his trees. Climbing a a fence, or pushing aside a picket, and pelting the choice apples, pears, etc. from the trees, is. I am sorry to say, not considered generally a misdemeanor, or theft, at the present day. And a peremptory order to desist such intrusion, brings upon the owner the anathema of "how mean!" The venerable D. Thomas re-marks, "no insect, no birds and no malady among fruit trees have discouraged nomologists so much as the depredations 6f our own species," and as an antidote urges "that all persons should be induced to grow their own fruit, as he never knew a boy to steal fruit, whose father raised fruit himself," to which we would respond Amen. W. R. Coppock. Longsight Place, near Buffalo, N. Y., Jan. 1,1861.