SECT. V. 



GEMS. 277 



a much stronger contexture than that of the inner 

 side, and much more easily detached, as may be 

 seen in the scales of the buds of the Horse-chesnut 

 and Filbert ; in which last the inner epidermis is so 

 incorporated with the pulp, as to be detachable 

 only in very small portions. 



But as buds produce either leaves or flowers, or 

 both, it was to be presumed that the leaves and 

 flowers must exist in an incipient state in the bud, 

 long before the period of their evolution ; which 

 presumption the dissection of buds has shown to be 

 the fact. 



If the scales of a leaf-bud are taken and stripped And inter- 

 off, and the remaining part carefully opened up, 

 it will be found to consist of the rudiments of a 

 young branch terminated by a bunch of incipient branch 

 leaves imbedded in a white and cottony down, being 

 minute butcomplete in all their parts and proportions, 

 and folded or rolled up in the bud in a peculiar and 

 determinate manner. This has been denominated the 

 foliation of plants, and reduced by Linnaeus to ten 

 different modes.* 1st, The Involute (PL VIII. 

 Fig. 4.), in which the lateral margins of the leaves 

 are rolled inwards on both sides, as in the Apple, 

 Poplar, and Violet. 2dly, The Revolute (PL VIII. 

 Fig. 5.), in which the lateral margins of the leaves 

 are rolled backwards on both sides, as in the Water 

 Lily, Primrose, and Pellitory. 3dly, The Qbvolute 

 (PL VIII. Fig. 6.), in which the margins of one 

 L * Phil, Bor. Tab,*, 



