fruit for the million, as well as for the culture of common vegetables The aristocratic hothouse, stocked with the rarest fruit trees and flowers, remains; nay, it spreads more and more for growing luxuries which become more and more accessible to the great number. But by its side we have the plebeian greenhouse, which is heated for only a couple of months in winter and the still more economically built “cool greenhouse,” which is a simple glass shelter — a big “cool frame” — and is stuffed with the humble vegetables of the kitchen garden: the potatoes, the carrots, the French beans, the peas and the like. The heat of the sun, passing through the glass, but prevented by the same glass from escaping by radiation, is sufficient to keep it at a very high temperature during spring and early summer. A new system of horticulture — the market-garden under glass — is thus rapidly gaining ground.
The greenhouse for commercial purposes essentially of British, or perhaps Scottish, origin. Already in 1851, Mr. Th. Rivers had published a book,