(8*2) 
Fim Expmmmtum, Since we are now in that very feafon, to fee whe- 
ther that early afcent is to be imputed to the forwardnefs of the year, or 
not ? Let it aifo be obferved, whether the Sap afcends in Oak^ and Elme , 
at any time in this month of January ; and likewife, which of thefe three, 
the Maple^ally y or Willows , be the mofl early in yielding of Sap f 
And to ofctain an Univerftl and Accurate knowledg of the nature of Sap 
in Trees, its properties and accidents ; Obfervations and Tryals muft be 
made by a Number of men, that have leifure to attend that bulinefs daily ; 
which are to examine concerning every Tree ; 
1. Its Age ? Soyle, Situation,^, the variety of the Afcent of the 
Sap depending thereon,as on the nature of the Tree it felf. 
2. The different time of Afcent in Branches, ; Eody, Hoot*- and of its 
diftilling from cut branches • from roots, not from branches. 
3. The Seafons and differences of the rime of the year, month and day, 
in which thefe accidents fjappen or ceafe • whereby it may appear, what to 
determine concerning them : And. particularly,whether that conjecture be 
well-grounded • wh ch fuppofes^ That Sap does not defcend from Trees 
otherwife than by jellying fo as to fail above, whilft there is yet plenty be- 
low ; as feems to be manifeft by the running in the Roots, when it ceafes 
in the Branches. 
It were aifo not amift to obferve, Whethtr in any Trees,*he Sap as to 
its afcendings, keeps time with the Sirs entrance into this or that Sign f 
To the 1 1 th. The fame. The beft time of the day for Tapping, is about 
Noon. In the latter feafon, when Sap is not very plenteous in Trees, they 
will neither run morning, nor evening, nor probably at any time of the 
night ; but when they are very full of Sap, and emptied but by fmall 
vcn% the Sap may run night and day, till exhaufted ^ but never in large 
vents. 
*%uere s Whether this Obfervation may not give light to that Opinion, 
which hold?, that the Afcendingof theS?p depends upon the Preffure or 
Pulfion of Heat, ftriking the Earth, and thereby driving the moifture of 
the. Earth into the R oot ? 
To the 1 2th. The fame,. Trees afford no juice at all ( that has been ob- 
ferv'd) in Autumne, 
To the 1 3th. The fame. Rain being fcarce , the juice will be fcarcer. 
Plenty of Rain cm onely give fuch plenty of Sap, as the pores will 
admit. 
The Anfwers to the reft of the Queries -we referve for another Month^ lea ft 
thefe Papers be altogether filled with one fuhjeU. Thofe that have been de-- 
liveYd herefrom Dr.Tonge-tytrefor the mofl part taken out of his Letters to 
Sir R. Moray, in January, February, March, April!, 1666., at which 
time he had newly made Experiments about Saps and are now, after confe* 
rence with him, accommodated to the Queries formerly made public^. 
AnfWen 
