_Blight on Grain from the Barberry._--In the Chronicle of August 19, under the head of "Vulgar Errors," we read as follows: "People still maintain that the barberry blights their grain." This is, nevertheless, a matter deserving attention; for in this, as in many other instances, a popular prejudice has been founded on truth, although the real cause has been often overlooked. Some writers have treated this subject with respect, and among them is Dr. Thornton. The latter says that the "leaves are very subject to the _rubigo_, which will infect the grain in the neighborhood." Here the secret is at once explained, and the aversion of farmers to the barberry-bush at once justified. The vulgar notion is, that the barberry exercises some evil agency upon grain within a certain distance, and accordingly farmers will never suffer it to grow near their fields. They are right as to the effect, but they attribute it to a wrong cause. I have seen some remarkable instances of grain perishing in a semicircle, in front of a barberry-bush, and extending a good way into a field. Any one who has but superficially noticed the barberry, must have observed that the leaves and young shoots of the shrub were covered with a peculiar kind of blight or mildew. Now it is by no means extraordinary that this should be carried by the wind into grain-fields, and infect the grain so as to cause its destruction. This is the true explanation of the mischief caused by the barberry to grain in its neighborhood. [This is the common explanation, but if any one will take the trouble to examine the parasitical plant which attacks the barberry, and that of grain, he will find that they are totally different things. One is the AEcidium Berberidis, and the other some species of Uredo or Puccinia, for it is sometimes one and sometimes the other. We should as soon believe that a hen's egg would be hatched into toads, as that the seed of an AEcidium would produce an Uredo or Puccinia. We are aware of the facts mentioned by Mr. Wighton, for we have seen them ourselves, and they form a curious problem yet to solve.] REVIEW OF THE MARKET. PRICES CURRENT IN NEW YORK, NOVEMBER 28, 1843.