Experiments, with this substance diluted, have been made within the circle of our own knowledge, and uniformly resulted favorably. We observe that a French scien-tist, M. Eusebe Oris, has been making detailed experiments, and finds the following definite conclusions: That the salt is a stimulating manure; that it presents no danger when intelligently applied; that its action is evident upon the coloring principle of leaves; that from its cheapness a few cents' worth is sufficient to treat hundreds of plants; that it might be applied to cultivation on a large scale, and especially to the cultivation of fruit. His manner of applying the sulphate is as follows: A solution of two drachms to one quart of water is made, and with this the plants, previously placed in the shade, are watered. It is presumed that the earth surrounding the plant is moist; if this is not the case, a more dilute solution must be used. The solution may be applied daily for five or six days; about two and a-half ounces are sufficient for each watering of an ordinary-sized plant, as a calceolaria.

Plants which have become sickly, colorless, and etiolated, will, under this treatment, quickly recover a full green color, give finer flowers, send forth more vigorous shoots, and generally show the good effects of the tonic.