I noticed an extract in the Canadian Horticulturist from the Garden, London, of a party that had been experimenting with this material which induced me to try it, and as his experiments cannot reach many I will repeat them briefly, adding my own opinions of it.

He says, " I had used this as a deodorizer and disenfectant and as such recommended it to a friend. For convenience sake he kept it in an old can near a houseful of Pelargoniums. A young practitioner took it and watered the plants on one side of the house with it. Dire results were expected from it, but quite the reverse was the result, for the dosed plants showed increased instead of diminished vigor. I at once commenced a series of experiments with it, using an unvarying strength of as many crystals as covered a six-penny piece to one gallon of water, for watering the soil; but for syringing used double the quantity of water. Rare ferns, fuchsias, tender grasses, roses in pots etc, are to all but myself a mystery of luxuriance;'• and goes on to state that he had tried plants in sand saturated with a strong solution, covering the surface with cork to keep the roots out of the light. Those plants are vigorous and alive.

For vase plants it is evidently good as the water does not require changing or become offensive but preserves them in an unusual freshness and vigor. I have also used it in glass buttonhole holders, the flower stalks seized and absorbed the coloring matter in about an hour. This was especially the case with yellow flowers. Overhead watering with this liquid is disastrous to our common enemy, the green fly.

An amateur of considerable experience told me my plants never looked like what they do this year. My primulas are especially fine. I attribute it to the use of permanganate of potash which I have been using on them this winter. Green fly has entirely disappeared. From his remarks I looked up the article I have given a part of and my experiments carry out what is stated. I have doubled the quantity and syringe every second night with it. Green fly and mildew on roses have disappeared, and the plants seem to have renewed vigor; but as yet time has not permitted me to give it as a deodorizer the full value he does. In using it for syringing I find that when it stands mixed for any time it is liable to leave marks on the leaves. Not so if it is newly mixed. It is also an extremely cheap article, and will be easily reached by any who wish to try it. A continued application for some time to see its effect properly will have to be pursued. Although it kills green fly, it will not prevent new crops coming; and every one ought to know how fast that is.

Supt. Government Grounds, Canada.