. C 488 ) 
able to difcern any Sap to iflue out of that part, when a 
Branch has been cut. The Microfcope plainly (hews us 
the Veflels in the Wood, through which the Sap rifeth 
from the Root ; but as thefe Tubes are not large enough 
to admit into them any thing more grofs than Vapour, 
fo they have not been efteem’d to be of any great Ufe. 
But I hope the Explanation of the adjoynd Figure will in 
fome meafure difcovcr the Office of thefe, and of fuch 
other parts of a Plant as are feverally defign’d for the 
Growth of Vegetables; but it will firft be convenient to 
enquire a little into the Nature of the Root. 
IsThe Root of a Tree is chiefly compofed of a Paren- 
chyma; more grofs than that in the Stem or Body of the 
Tree; it has likewife Veflels and a Covering, which I 
ihall better explain in another Paper. The Root, that 
iSj the principal part of it, receives into it fuch Juices of 
the Earth as are proper for it, and no other. Some- 
what like a Week of Cotton, which having been im- 
pregnated with Oil, will only admit Oil into it. This 
Provifion being made in the Stomach of the Plant (as I 
call it) chiefly in the Autumn Months, the Tree is pre- 
pared for Germination fo foon as the Earth is fufficiently 
warm’d, either by the Sun’s Beams, or an artificial Heat, 
fuch as Horfe dung, Bran and Water, or other fuch like 
Ferments. Thefe Heats raife into Vapour the Juices con- 
tained in the Root* and by that means caufe . Vegeta- 
tion. 
Figure [. which I am about to explain, is part of the 
Branch of an Apple Tree made in May 171 5* and cut in 
April 1 7 1 6. It was cut in figure of a half Cylinder, the 
lengthTomewhat more than the Diameter, which was 
about a quarter of an Inch. This being magnified 
with one of Campari's Microfcopes, difeovers the fol- 
lowing parts, viz. 
J,.i, 
