< 
Of Leaves. 257 
Mr. Leeuwenhoek, tearing to Pieces a 
Leaf of the Species of Box called Palma 
Cereris, that he might examine it the better, 
computed one Side of it to be furnifhed with 
an hundred feventy-two thoufand and ninety 
Pores $ and as the other Side mud have as 
many, the whole Number of Pores in a lingle 
Leaf of Box will be three hundred forty-four 
thoufand one hundred and eighty. 
The Leaves of Rue feem full of Holes like 
a Honey-comb ; all the Kinds of St. Johns 
Wort appear likewife duck full of Pin-holes 
to the naked Eye ; but the Microfcope {hews, 
that the Places where thofe Holes feem to be 
are really covered with an exceeding thin 
and white Membrane. 
The Back Side of the Herb Mercury looks 
as if rough-cad with Silver, and the Ribs full 
of white round tranfparent Balls, like num- 
berlefs Grapes, fadened by flenderFootdalks. 
A Sage Leaf appears like Rug or Shag, 
full ofKnots taiTeledwith Silver Thrums, and 
embellifhed with fine round crydal Beads or 
Pendants, fadened by little Footdalks. 
The Backdde of a Rofe Leaf but efpe- 
cially of Sweet Briar , looks diapered with 
Silver 
Every Body knows that the Leaves of 
Stinging Nettles are thick fet with fharp 
* Dr. Power’s Microfcop. Objerv » 
S 4 Prickles^ 
