Experiments 
€omerning the motion of the S^f m Trees ] made thk 
Sfring hy Mr. Wiilagby^ ^Wilfr, Wray, Fellowes 
of the R. Spaety : an A communicated to the Puhlijher 
cf the Inquiries touching that fuhject in Numb. 40«' 
lo - f N Birch'txQQS the Sap iffues out of the leafl: twiggy 
. £ of Branches 3 and fibres of Roots 5 in pioportioKi 
to their fcignefs. 
In all Trees the Gravity promotes the Bleeding-, fothat 
from a Branch or Root, that beodes downward;, theiewill 
liTue a great deal more Sspj than from another of the fame 
bigaefsin a mare cred pofture, 
3. Branches and Young trees cut quite off when they are 
full of Sap 5 ^nd hdd perpendicukrly, will bleed 5 as we ex- 
perimented in WilloWyBirch y and Sycamore : And If you cu'S^^ 
off their tops,, and insert them ^ trey will bked alfo at the 
little ends. Hence one may coojedurej that the narrownefs 
of the pores is not the (ok ciufe of the Afcent of the Sap § 
far 5 Water that hath afcended- in the little glafs-pipes^ will 
not fall out agaiae by its own gravicy ., ii- the pipes bs 
taken out of the water. 
4. Roots of Birch and Sycamore cut afunder will bleed 
both ways 3 that is^, from that put remaining to the Tree ^ 
and from the part ftpiratcJ-, but a great ceil fafter from 
the part-remaiuiag to the Tree, But in a cold iiiowy day 
the Root of one Sycamore-^ we had bared ^ bkd f^fkr from 
the part fepatatedj and ten times fafter than it did in warm 
weather before, 
5. ^ In Birches the Sip does not iffue cut of the Barke^ Be 
it never fo thick, bus as fooneas ever you have cute the 
Birke quite -through ^ then it fiift begins to bleed. 
• 6. The Bark htmg quite pare J off above an hands breadth 
round 5 about feverall Birches ^ did much abate the Bleeding ; 
of the Trees above ths bared pieces ^ im dA not quite 
il:op i^ : , . ' ■ Z , / • 
7. -T-he Sap loth not omy nafcenil bew^e rBirk andT/ee^ 
