Facts, however trivial in themselves individually, become in the aggregate of immense value in building up a theory or illustrating a practice; for we must recollect that a theory is as often the child of experience, as that practice is illustrated by it, although such may not appear evident at the moment. The action of cold on plants is of vital importance to the practical gardener, as well as interesting to the natural philosopher. The relation of temperature to some 20 miles by waggon on a frosty night, and not being properly protected (although the baskets containing them were matted in the ordinary way,) they were completely frozen through when they arrived at their destination, by daylight in the morning. So much were they frozen, that the succulent tops for several inches, were apparently masses of ice, and nearly the whole of the leaves had suffered more or less. On the extent of the damage being known, the whole of the plants were quickly removed to a dark cellar; and, to make "assurance doubly sure," a covering of mats supported by a temporary frame-work, was thrown over them. Water, only removed from the freezing temperature, was freely applied to the foliage, and no light admitted for 24 hours. On removing them, the damage they had sustained was but nominal.

Scarcely a leaf had suffered, except such as had been bruised in the unpacking. Every leaf or part of a leaf so damaged, had to be removed. Another instance: - On a festive night in midwinter, the person in charge of a conservatory forgetting, or by procrastination omitting to apply the necessary artificial temperature, to expel the frost, (for it had set in severe rather unexpectedly) found, on his entering the house at 4 o'clock in the morning, that the tender plants were much frozen. He applied fire to the boiler, raised the temperature a degree or two above freezing, and then liberally applied cold water with the syringe. The result was, that nothing beyond a few leaves on a stray shoot or so, evinced any damage, and by sunrise all was as promising as could be wished; so completely were the plants recovered, that the circumstances would never have been reported in the Chronicle had not the delinquent revealed the mishap after all danger of detection was past. One more: - A house of Geraniums was penetrated by the frost, the plants were much frozen, and the frost was on the increase when the circumstance became known in the morning. Cold water was in this case applied, but without the precaution of raising the temperature above freezing point.

The result of course, was, that the water, as soon as it fell on the foliage, became ice, till the plant looked encased in candied sugar. The more water the great-This detected, a fire was lighted, centive to a rapid reaction of the vital pour-ers should be applied only in the most limited degree, increasing stimuli with the requirements of the plants, retarding rather than accelerating vital action. As regards the action of light on plants, a wide field is open to the ingenious experimentalist. Let a given number of plants be frozen; admit to some light in its ordinary condition, from others exclude the chemical ray; from more, both the chemical and heating ray; to others admit only the luminous, or vary its application in the many ways which will occur to the chemist. The result must be of importance alike to the gardener and the pure man of science. G. L.- Gard, Chron.