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E X P L A I N E D BY T H E ..M I C R 0 S C 0 P E. 5 9
t h e months of March and July, there is a watery fubacid juice, a true Sap, untainted PLATE
b y the peculiar medicinal juices of the Tree; and at other times they are entirely
e m p t y : no turpentine being ever found in them, unlefs forced into their open mouths
f r om fome other part of the Tree. The Corona, k, is a thin but viry diftina and ^
elegant circle j and the Pith (which is not ufual unlefs in refinous Trees) is Coloured
and clammy j and balfamic Veflels, containing a peculiar turpentine, a yellow kind,
o f a coarfer fmell than the reft, • rife thro' the Pith. Thefe, in the cutting, flied a
part of their contents, which fpreads among the bladders of the Pith j and gives the
whole that colour and that flavour.
C H A P . II I .
P A R T I C U L A R I T I E S IN T H E V A S A I N T IMA OF TREES.
1. T H È I R S I M P L E S T STATE
T H E H E L I - O T R O P I U M ARBORESCENS.
A'S t h e Va f a i n t ima o f P l a n t s have t h e i r p r o p e r place in t h e f u b f t a n c e o f t h e Elea, p L A T E
• never being found in any part exterior to that, tho' foraetimes farther within ;
w e triay judge that to be their plaineft and fimpleft ftate where they are found in a
fingle feries in that part; and only there. Such an inftance is the Tree Heliotrope,
P l a t e XXXIX. This is one of thofe kinds which are warped to the fun, and in
w h i c h all the inner coats conform themfelves in fhape to the exterior form of the
Branch ; and confequently form in their outline, not circles, but irregular and waved
ellipfes. The Rind and Bark of the Heliotrope, a è, have nothing in them peculiar,
unlefs it be that the Rind is mor e uneven than in many others. The Bica, c, is v i i f ,
and toward the inner par t of it is placed a range of oval Veflels, d, filled with a thick,
w h i t e , acrid juice, of the nature of what are called gum refins. "Within thefe Vafa
i n t i m a the Blea is more compaft by far than near the Bark ; and within this lies the
Wood, e, beautifully pierced with round mouths of Sap-Veflels, which in July, when
I laft cut the Shrub, wer e fo abundantly replete wi t h a fourifli water , tliat they floated
all the feftion witli it, and ran over every way at its edges. The Corona, f , here is
a very delicate l ine, clear, except where thè cluilers of the VeffeJs are placed -, and tlie
P i t h , g, is large and plain.
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