(83o) 
Additional Anfmrs of Dr. Tonge to fome of the Queries about 
Vegetables, printed in Numb, 43. 
TO the nth. I add, that the Sap ofa large Walnut 
in the latter feafon of its running, i. e. when it yields no 
fap any longer in the Body or Branches at any time of the day, 
runs longer atthe roots on the South or Sunny-fide, than on the 
North orfliadyfide. 
To the nth. Birch-trees bored in the Spring folate, in refpeft 
both of the year .and day, that they have afforded no Sap at all 
at the body, ^tve been found (ometime after, to have iffued 
fuch plenty bf juice, as hath condenfed in the hole to a ftiffjelly, 
This I fuppofe to have rifen not about Autumn, (as fome con- 
je&ure) but in the heat of fome day the fame Spring , or in 
fome extraordinary hot day following after that tryal, or the 
hole to have been made too late in the evening after the tree 
hathceafed to run for that day :Orelfeit hath in fome favorable 
feafon run earlier than ordinary in the Spring following. But this 
is left to farther tryal 5 as alfo-, Whether the ftp in trees, e.g. 
in Maples, will not run fomedayes fooner at the roots, than at 
body and branches as they alfo run at roots fome dayes longer 
than at body and branches. 
To the 1 3 th. As plenty of Rain can caufe no more plenty of 
Sap than the pores of the root, body and branches will admit $ 
vvhich muftftay fome time to be digefted, 2nd converted into 
noui ifhment : So too much cold rain may by over-cooling hinder 
the S:>p,by abating from the degree of heat neceffary to pulfion 
of Sap into the root,an d to the digeftion in the tree which is alfo 
in watering. On this ground it feems probable, that drawing 
Sap conftantly from trees every year,will not hinder their growth 
in bo 'y, branches, leaves , nor fruit, to any great prejudice ; for, 
pullion will ftill fupply juice into the emptied pores P till their 
capacity be filled. 
It is poffible alfo, that trees tray grow better, and give more 
fruit, if the right art of drawing ftp be found out for that end 5 
as fome perfons grow fatter by often Bleeding. If plenty of Sap 
drawn from trees hinder at all, it feems probable, that it wJi hin- 
der 
