. The gardener's assistant; a practical and scientific exposition of the art of gardening in all its branches. Fig. 987.—Specimen Tree of Downton Nectarine under Glass, Royal Gardens, Frogmore. 182 THE GARDENERS. ASSISTANT. the aim, but the greatest amount that the suncan shine upon with the fullest effect. We may suppose that the roof of a forcing-house is composed of one entire sheet of brightglass, and that between this and. the floor amedium of ground glass is to be interposedwhere it will transmit the greatest quantityof light. To do this it must be placed where. Fig. 988.— Early Peach Hr
. The gardener's assistant; a practical and scientific exposition of the art of gardening in all its branches. Fig. 987.—Specimen Tree of Downton Nectarine under Glass, Royal Gardens, Frogmore. 182 THE GARDENERS. ASSISTANT. the aim, but the greatest amount that the suncan shine upon with the fullest effect. We may suppose that the roof of a forcing-house is composed of one entire sheet of brightglass, and that between this and. the floor amedium of ground glass is to be interposedwhere it will transmit the greatest quantityof light. To do this it must be placed where. Fig. 988.— Early Peach Hrmse. Scale i in. to 1 foot. the light or the suns rays can act through thesheet of glass with the greatest intensity. Itmust, then, be placed so as to form a plane nearto and parallel with the plane of bright medium of ground glass might be wavedto curve away from the glass roof like thecircular front trellises which some recommendfor the Peach; and having receded consider-ably, it might then curve upwards to the topof the back wall. This curving would requirea much greater surface of ground glass than aplane running parallel to the roof; but thelight below would be considerably less in theformer than in the latter case, because thelight after passing through the bright mediumwould act with diminished intensity on theportion of ground glass situated at a distancefrom it. If we take a lens and hold it nearthe glass of a forcing-house when the sun isshining, touch-paper will be readily ignited;but it will not be so if the lens is held at adistance fr
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Keywords: ., bookcentury1900, booksubjectgardening, booksubjecthorticulture
