NOXIOUS WEEDS. Besides the useful plants introduced for field and garden culture, mankind have been unwilling agents in distributing a greater number which are classed as noxious weeds. They follow his migrations with never failing certainty, and sooner or later find their way into every nook and corner which is not carefully watched and cultivated. Prompted by a worthy ambition to raise large crops and pretty flowers, and to possess the best of everything, hundreds of men have tried Norway oats, Alsike clover, new varieties of wheat, barley, turnips and various grasses. They have imported from the Middle and Eastern States, Canada, and even Europe, Africa and far off Asia and Australia. After a year or so, the farmer too often finds that he got more than he bargained for. The thrift which he looked for in his new plant, seems to have departed like an evil spirit into the weeds and caused them to grow, and spread and increase with astonishing rapidity. There is trouble ahead-"foul stuff," "bad weeds" have come to contest the soil of the virgin prairie, with corn and clover. These unwelcome visitors will crowd hard, and most likely conquer, and at last find a permanent abode. A few men look at the intruders with suspicion, and destroy them all, perhaps send one to some botanist, to learn what to call it, but most likely they are allowed to grow for a while. If the people only knew the nature of their vicious enemy, they would begin the war of extermination at once. Of weeds which may be called troublesome, we raise, perhaps, eighty species, while twenty others are very. annoying. If men had good specimens of these with which to compare, in nine cases out of ten they could easily decide the question for themselves. Professor W. J. Beal, of this city, has called our attention to a plan which we think a good one. That is, to prepare sets of twenty to one hundred species and sell to any who may wish them, whether gardeners, enterprising farmers, schools, farmer's clubs, or agricultural societies. The plants, if possible, will be collected in the Northwest, where they often appear quite different from those growing in the shallow soil of New England. He offers to furnish, if the number of subscribers equals one hundred, sets of ninety species for the very low price of five dollars, each specimen accompanied with a number which corresponds to a numbered catalogue. The catalogue will contain the common and scientific names of each number, and a few words about the habits, origin, easiest mode of destroying, &c. He will if desired make up more extensive collections of grasses, sedges, or any forage plants common in the United States. Those who are willing to subscribe for "a set" or a less number, will please send names at once, that no time may be lost in collecting this season. Address W. J. Beal, No. 3 Scammon Place, Chicago, Ill. For the general good we shall be glad to see our exchanges copy this notice.