. The small rock garden. Fig. 29.—THE WHITE SIBERIAN SQUILL(SCILLA SIBIRICA ALBA). it was an inflexible rule that the side and roof ventilatorsshould never be closed. I had faith in the completehardiness of my subjects, and provided them withhygienic conditions by a constant circulation of of the finest collections of choice alpines I ever hadin my keeping was in an amply pigeon-holed brickframe at back and front, yet those plants, in the teeth The Alpine House of wind and frost for weeks with the thermometerrepeatedly at zero, came tlirough the ordeal dryness is ther
. The small rock garden. Fig. 29.—THE WHITE SIBERIAN SQUILL(SCILLA SIBIRICA ALBA). it was an inflexible rule that the side and roof ventilatorsshould never be closed. I had faith in the completehardiness of my subjects, and provided them withhygienic conditions by a constant circulation of of the finest collections of choice alpines I ever hadin my keeping was in an amply pigeon-holed brickframe at back and front, yet those plants, in the teeth The Alpine House of wind and frost for weeks with the thermometerrepeatedly at zero, came tlirough the ordeal dryness is therefore important. I am em-phatic on this point, possibly a little dogmatic, havingseen the dangers and drawbacks of a little heatappUed and misapplied, and equally so that caused by. Fig. 30.—A CHOICE ROCKFOIL FOR THE ALPINEHOUSE (SAXIFRAGA BOYDII ALBA). condensing moisture consequent upon completelyclosing up the house. In a few words, the alpine houseis intended to preserve character, not to destroy it.(Figs. 29 and 30). The Ideal Structure.—The nearest approach to theideal is that known as span-roofed. It should occupya position entirely in the open, with uninterrupted access 72 The Small Rock Garden to light and air, and commanding a maximum of wintersunlight. For convenience, a width of ten feet or twelvefeet should do quite well, with ridge placed about sevenfeet high. It should be arranged from ground level,and not partlj;^ sunk—^pit-house fashion. The mostcomplete system of bottom, side and top ventilationthat can be devised should be indulged in so that allparts of the house may be abundantly ventilated at alltimes. Internally the staging should be raised to thelevel of the opening side lights so that the plants areever receiving fresh supplies of a
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