At a meeting of the Academy of Natural Sciences of Philadelphia, a specimen of a grass, Setaria viride, was exhibited not over half an inch high, but which had a large number of perfect seeds nearly mature. It was sent. by Mr. Meehan to show that such minute plants might grow and produce seed annually for many successive years, the plants each year reproducing themselves among other vegetation, without any one being aware of their existence. When such tracts were ploughed up, and plants like this grass get a good chance to develop themselves fully, it would appear that there had not been any plant of the species growing for years, and the fact used to illustrate the long vitality of seeds in the earth. It might be that there was good evidence that cases of long vitality were undoubted; but it served a good purpose to point out where error may creep in.