y 



^Vli. 



Sect. XVIL- 



ROOTS AND BARKS. 



471 



flowers. %', Rub of the mojs. Sprinkle with water. 9. Wounds of the hark. 

 Paint the nake 4 alburnum. 10. Canker. Bind on a new hark. Flant the 

 branch in a divided garden -'pot.. 



'illy frm 



an re 



nfihle \ 



in 



w knolkj 

 'vigorous 

 rornfub- 

 "lar /oil 



*-OGts and 

 It by Jed, 

 t. Snow 

 )ranching 

 :Gntinu£ to 



irt to p- 



^ere 



iwit^ 

 and hsaf' 



uds ^¥ 



inch cS^\ 



- 



As the barks of trees j^re compofed of a congeries of the long cau- 

 dexes of the individual buds, which confifl: of the abforbent veffelSy 

 which imbibe nutrin:icnt frona the earth, and of the arteries and veins, 

 which fupply nutrinient to the growing vegetable j of the glands, 

 which fecretefroni the vegetable blood the various acrid, aftringent, 



or 



juices to defend them from the depredation of infed 



d the various m 



c> 



ly, or facchar 



materi 



for th 



(hment of their cmbryon buds ; and laftly, of the organs of re* 

 on. There exifts the ftrongeft analogy between the barks 



prod u (51 ion, 



of the trunks of 



and of their roots, in every refpe£t 



that the former pofleffes a cuticle adapted to the contact of the dry 

 atmofphere, and the latter a cuticle adapted to the conta6l of the moid: 

 eartTi, which differ from each other like the external fkin, and the 

 mucous membranes of animals. And finally, as thefe long caudexes 

 of the buds of trees, which form the filaments of the bark, termi- 

 nate in radicles beneath the foil, and in leaves in the air, like the 

 broad caudexes with the radicles and afcending flems, or foliage, of 

 herbaceous plants, they exactly refemble each other. 



We fhall therefore divide roots for the purpofe of treating of their 

 production into bulbous or tuberous roots, into palmated or branch- 

 ing roots, and into barks ; obferving that though roots and buds- 

 might pofTibly have exifted before feeds, and though a great number 

 of the roots ufed for nutriment, or for the purpofes of medicine, or^ 

 for the arts of dying and tanning, are immediately produced by buds, 

 or bulbs; yet are they all, which Vv'e now polTefs, originally derived,. 

 I fuppofe, from feeds ; becaufe thofe varieties, which havx been pro- 

 pagated from buds or bulbs for many centuries, are believed to ac- 

 quire hereditary difeafes, and gradually to perifh. ' 



i; 



Op 



