. Paxton's Magazine of Botany and Register of Flowering Plants. lower is brightyellow, but, aa far as we have been able to deter-mine, the lobes never expand, and it is always seenin thf closed state shown in the figure, with thogcrmen and its style protruding slightly woodcut, as it includes the entire plant, willafford a notion of the common habitude of tlie regard to cultivation, it should be pottedin a soil composed chiefly of turfy heath-mould, to•which may be added a little open loam and plant must on no account be overpotted, andparticular caution is re
. Paxton's Magazine of Botany and Register of Flowering Plants. lower is brightyellow, but, aa far as we have been able to deter-mine, the lobes never expand, and it is always seenin thf closed state shown in the figure, with thogcrmen and its style protruding slightly woodcut, as it includes the entire plant, willafford a notion of the common habitude of tlie regard to cultivation, it should be pottedin a soil composed chiefly of turfy heath-mould, to•which may be added a little open loam and plant must on no account be overpotted, andparticular caution is requisite to preserve it fromsuperfluous moisture, which, if allowed to collecteither in the air or about the roots, inevitably killsit. It should be placed in a light, dry, and airypart of the greenhouse, and if thus managed, there--^?*^^ will be no danger of its being destroyed. Cuttings of tho young branches may be struck in a moderate heat, if dampness be properlyavoided. The genus commemorates JI. Witsen, a Dutch patron of botanical 22S OF GARDENING AS A SCIENCE. NO. X.—LIGHT. It is not our object to undertake the investigation of this most mysteriousprinciple as connected with optics, or the doctrine of colour; we treat of vegetables andthe phenomena elicited by the natural agents (of which light is the chief) upon theirorganic stnicture and developments ; nevertheless, it will not be irrelevant to alludeto the interesting experiments of Sir Isaac Newton, the late Sir William Herschell,and others, so familiarly known to philosophic readers, by which the divisibility ordecomposition of a ray of white solar liglit has been proved, and the different heatingpowers possessed by the ray, when so divided, exhibited. When a sunbeam is made to pass through a triangular piece of polished glasscalled a prism, an oblong image termed a spectrum is produced, which displays ona white screen seven primitive colours, namely, red, orange, yellow, green, blue,indigo,
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