V 



i-i o 



PRODUCI'ION OF 



Sect. XVllI. 1.3 



pears by the too luxuriant growth both of herbaceous plants and of 

 fruit trees in moift feafons. 



Another r^ethod of forwarding the growth of the new leaves and 



Hem-fhoots of peren 



baceous 



as 



of afp 



nually to loofen or turn over the earth around and above the roots, 

 for the purpofe of admitting air into its cells or cavities to convert a 

 part of the manure or carbonaceous foil, with which they have been 

 fupplied, into ammonia, or into cai 

 ford them warmth and nutriment. 



Add to this, that the leaves of trees may be increafed in fize by lop 



bonic acid, and thus both to af- 



ping off the branch 



more nutriment 



th 



by which means the remaining buds acq 



black mulberry 



IS 



th 



kept 



ow 



d 



formed into exten five duubberi.es in China for the purpofe of feed 

 lilkworms, as obferved by fir G. Staunton, 



who thinks th 



are thus rendered both larger and more fucculent ; and adds, that thi 

 afli-tree is alfo fometimes ufed for the fame purpofe. 



3. Another method of deflroying the too great acrimony of leaves 

 befides that of boiling them, confifls in fecluding them from lio-ht 



d is termed 



by earthing it up nearly to the top of the 



This is chiefly pra<£bifed on cellery, apium 



d on fea-kale 



mbe maritima, by covering the plant entirely with horfe 



3; 



flraw, as defcribed in Se6l. XIV. 3 

 by tying together the root -leaves with a band 

 In many plants the central bud during its 



d on lettuces, and endiv 



^— r 



be 



ally 



ftate of 



as It is 



ly growth feems to 

 ded from the light 



by the curvature of the furrounding foliage, as in cabbages, and p^ 

 ticularly in fomd fpecies of aloe, which are faid to confume nearly 

 a century in opening their numerous concentric fol 

 lated leaves, lilce flowers before the calyx is opened 



Thefe 



hite : and 



become green, or the flowers of many other colours wh 



pofed to the.light, as explained in Sed:. XllI 



3 



It is probabi 



that the foliage of many other plants might be rendered e/cuJent by 



4 



:th 



