42 



THE LEAF-BUD. 



19'?. Nature op the scales. The scaly envelops of the bud appear to be either 

 the rndimentaiy leaves or stipules of the preceding year, formed late ia the season, 

 arrested in their development by the frosts and scanty nourishment, and reduced 

 to a sear and hardened state. If the bud of the rose, tulip-tree, or horse-chestnut 

 be examined when swollen in the spring, the student will notice a gradual transi- 

 tion from the outer scales to the evident leaves or stipules within. 



67, Bud of currant unrulillug,--:'iie scales gradually becoming leaves. 68, Bud of tulip-tree,— the 

 scales unfolding into stipules. 



198. It is an interesting n^LUSTBATion OF designinq Wisdom that buds are fur- 

 nished with scales only in wintry climates. In the Torrid Zone, or in conservatories, 

 where the temperature is equalized through th6 year, plants develop their foliage 

 into buds immediately after formation, without clothing them in scales. In annual 

 plants also, the buds are destitute of scales, not being destined to survive the win- 

 ter. Hence it is evident that the transformation of autumnal leaves into scales, 

 is a means ordained by the great Author of Nature to protect the young shoots in 

 their incipient stages from sudden cold and moisture, — an office which they eU'ect- 

 iially fulfil by their numerous downy folds and their insoluble coat of resin. 



199. How BUDS ABE PEOTECTED. In many trees the bud-scales are clothed with 

 dense, downy hairs. In others, as in the horse-chestnut, balm of Gilead, and other 

 species of poplar, the buds are covered with a viscid, aromatic resin, resombhng a 

 coat of varnish. A considerable quantity may bo separated from a handful of such 

 buds in boiling water. 



200. The parent bud. In regard to position, buds are either terminal or axil- 

 lary — a distinction already noticed. The plumule of the embryo is the original 

 parent bud, containing within its minute organization the manifold parts of the fu- 

 ture plant — stem, leaves, flower, fruit — all to be successively unfolded in future 

 months or years. The unfolding of this first terminal bud in the one direction of its 

 point produces the simple stem. 



201. ORiaiN OF BRANCHES. But in every plant a special provision is made for 

 the development of branches. It is a general law that every expanding leaf shall 

 guhtend an infant bud in its axil, that is, in the upper angle of the insertion of the 

 leaf-stallj ; hence the plant may always have as many axillary buds as it has leaves. 



202. Axillary buds are especially noted as being either active or 



