^•I. 



/ 



9. 



I 



>; 



eatb 



tiioft 



o> 



n 



e 



dof, 

 :Uof 



Ceil 

 III,, 



Inarch, 



t 



are fee 



= d 



reted 





narcotic 



> 



but 



qua^ 



not in 



d in the pel- 



:itritious 



part 



'd, left thej 

 ?ftion of the 

 - quality, but 

 oil exprelTed 

 : almonds, 

 retiou ofva- 

 .3 the herb of 

 J the flowers 

 , thefe fBould 

 .s ; and other 



mg 



tanning. 



vith medi- 



to have 



been 



les 



9 



a 



as z?f''' 

 all ouf 



in 



) 





Tl 



Sect. VL 9 



I. 



SECRETIONS 



8 



A 



poffefs a fafer armour hi this panapoly of poifon 



the thorns of 



briars, and goofeben 



:? 



A 



s 



the bitter, narcotic, acrid, and terebinthinate, as well as th 



farinaceous, oily, and faccb 



matters, are fecreted 



fu 



m 



from the vegetable blood, and referved for the nutrition and defence 



buds and bulbs, they are in this climate generally found 



f the new 



more concentrated in the hybernaculum 



lodge of pi 



before the new fap is raifed by the umbilical or abforbent veflel 



^P 



Hence roots and barks, as well as fruits and 



feed 



in 

 are 



beft coUeaed in autumn, or in winter, for the purpofes of med 



f 



Thus the bark of oaks fhould be taken ofFfor the ufe of 



th 



ly fpring, before the leaves p 



th 



part of its aftringent or bitter juices is reabforbed, and carried 



the new foliage along with the faccharine fap-juice, which 



been depofited in the cells of the alburnum or fap-wood 



But as th 



barks of trees become loofei 



d much more eafily detached from. 



T 



the wood, when the fap-juice rifes in the fpring, this is the beft time 

 for debarklns them ; but the naked bole and branches fhould (land 



m 



till the facch 



matter collected 



th 



Iburnum has 



been expended in unfolding the new leaves ; otherwife it will fooa 



ferment and putrefy ; and the fap-wood 



thus quickly decay by^ 



J* 



X 



termed the dry-rot of timber, as mentioned in Sedl. Ill 

 The acids produced by vegetable fecretion have of late been 



d h 



bee 



found to be fo 



much fubje£led to chemical inquiry, ; 



numerous, that they have been named from the vegetables, or parts 



of vegetables, from which they have 



bee 



ded 



d 



m 



as the g 



ilic acid, oxalic acid. Many unripe fruits contain an auftere 

 acid, which is gradually converted into fugar by vegetable or chemical 

 procefies for the nutriment of their feeds, as defcribed in No. V. 4.. 



of this feaion. In other plants it exifts in the foot-ftalks of the leaves,. 



as 



% 



