T 



IX. 



2.1 



9. 



•«th 



^ farv. 



"^ : bgt 



'^ 



e 



^ 'r^^'^ixei 



o 



^P^i"2 ail 





it 



c root 



i 



ceafetoaa; 

 ^^^ the heart 



adl 



IS now 



-nnial plants^ 



for thi 



li 



pur 



es, called the 



, v^'nich have 

 ifhed w 



rni 



yi*\ 



:hc alburn-:; 

 re, after thej 



thu: rr- o> 

 them m^clia- 

 ►exture of the 



a 



bforb this 



f 



hich n- ; ^' 



- bV C-r 



:-»*T 



I 



it, 



v\ 



fOOtS 



of ve- 



tbs. 



ateP 



oft' ^^^ 



up 



war'" ■ 



1 



,'1 1» 

 is vi"^" 





Sect, IX. 2. 10 



BUDS, BULBS. 



163 



thol^ 



e o 



of the albu 

 phons, through 



, That the velTei 

 then- livhio- ftate occafionally a6t as capillary {y 



f the birch and vine in the bleeding feafon 



hich the fap 



IS 



firft puflied upwards by th 



forbent extremities of the roots, and afterwards returns downwards 

 partly by its gravitation in branches bent below the horizon, appears 

 from an experiment of Dr.Walker, mentioned in Se^. HI. 2. 4. 



Laftly, that the veffels of the alburnum after their vegetable 1 



fe 



a, pofTefs a power of capillary 



dion of the fap 



f permitting it to pafs through them occafionally, appear 



from th 



following experiments 



Firft 



branch 



f 



fo cankered 

 lly deflroycd 



young appic-tree was 



it was to- 



the bark for about an inch quite round 

 To prevent the alburnum from becoming too dry 



by exhalation, this decayed part was covered with thick white paint; 

 in a few days the painting was repeated, and this three or four times, 

 fo as to produce a thick coat of paint over the decayed part, or naked 

 alburnum, extending to the afcending and defcending lips of the 



and the branch bloflbmed and ripened 



wound ; this was in fpring, 



feveral apples. 



In a garden in Lichfield about four years ago a complete cylinde,r 



of bark^bout an inch long was cut from a branch of a pear-tree 

 nailed againft a wall ; the circumcifed part is now not more than half 

 the diameter of the fame branch above and below it ; yet this branch 

 has been full of fruit every year fince, when the other branches of the 

 tree have borne only fparingly. I lately obferved,that the leaves of this 



d pal 



d 



fruit lefs in fi 



on the other parts of th 



bark taken o 



fF 



wounded branch were fmaller at 



and ripened a fortnight fooner, th 



Another branch of the fame tree has a part of th 



.about an inch long, but not quite all round it, with much the fame 



-efFea:. 



The exigence of capillary tubes In dead fap-wood Is vifibl 



in a 



piece of dry 



which pe 



or 



fmok 



to pafs through 



Ih 



and In the.cxhaufted receiver of an air-pump both water and 



Y 



quickfil 



