The large houses of one big company are built close to each other, and have no partitions between. But this system cannot be recommended. Altogether, when I revisited Guernsey in 1903, I saw that the system of greenhouses which prevailed was that of long two-roofed glass “tents,” placed by the side of each other, but separated from each other by partitions preventing the circulation of the air over the whole block. As to the extensive _cool_ greenhouses on the Grande Maison estate, which are built by a company and are rented to gardeners for so much the 100 feet, they are simply made of thin deal board and glass. They are on the “lean to” or “one roof” system, and the back wall, ten feet high, and the two side walls are in simple grooved boards, standing upright. The whole is supported by uprights inserted into concrete pillars. They are said to cost not more than 5d. the square foot, of glass-covered ground. And yet, even such plain and cheap houses yield excellent results. The potato crop which had been grown in some of them was excellent, as also the green peas.[113] In Jersey I even saw a row of five houses, the walls of which were made of corrugated iron, for the sake of cheapness. Of course, the owner himself was not over-sanguine about his houses. “They are too cold in winter and too hot in summer.” But although the five houses cover only less than one-fifth of an acre, 2,000 lb. of green peas had already been sold as a first crop; and, in the first days of June, the second crop (about 1,500 plants of tomatoes) was already in good progress. It is always difficult, of course, to know what are the money returns of the growers, first of all because Thorold Rogers’ complaint about modern farmers keeping no accounts holds good, even for the best gardening establishments, and next because when the returns are known to me in all details, it would not be right for me to publish them. “Don’t prove too much; beware of the landlord!” a practical gardener once wrote to me. Roughly speaking, I can only confirm Mr. Bear’s estimate to the effect that under proper management even a cool greenhouse, which covers 4,050 square feet, can give a gross return of £180.