(4.) A bed of sand around the trunks of the trees will close in with the movement of the top by the summer and autumn winds, thus avoiding the serious damage often resulting from the swaying of the trunk making an opening in the soil for water to settle and freeze. Still another use is made of this sand in very dry seasons, which as with us would often fail to carry the fruit to perfection. On the upper side of large commercial orchards, large cisterns are constructed which are filled by a small steam pump. When it is decided that watering is needed the sand is drawn out, making a sort of circus ring around the trees which is run full of water by putting on an extra length of V spouting for each tree. When one row is finished the conductors are passed over to next row as needed. To water an orchard of 1,200 trees--after the handy fixtures are once provided--seems but a small task. After the water settles away, the sand is returned to its place. In the Province of Saratov we saw orchards with and without the sand, and with and without the watering. We did not need to ask if the systematic management paid. The great crops of smooth apples and pears, and the long lived and perfect trees on the mulched and watered orchards told the whole story of the needs of trees planted on black soil on an open plain subject to extreme variations as to moisture and temperature of air and soil. J. L. BUDD., IOWA AGRICULTURAL COLLEGE. Pear Blight.--No. 2. The mere "experience" of an individual, whether as a doctor of medicine, horticulture, or agriculture--however extensive, is comparatively worthless. Indeed the million "demonstrate it to be mischievous, judging from the success of quacks and empyrics as to money. An unlimited number of facts and certificates prove nothing, either as to cause or remedy." Sir Isaac Newton's corpuscular theory "explained all the phenomena of light, except one," and he actually assumed, for it "fits." Nevertheless it will ever remain the most thinkable mode of teaching the laws of light, and it is not probable that any more than this will ever be accomplished as to any natural science--if that can be called science about which we must admit that "it is not so; but it is as if it were so."