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40 T H E CONSTRUCTION OrF TIMBER
P L A T E Branch, and leave like that a little fpace behind them, e. In the new growth all
therefore is continuous except the Pith : the Veflels are only lengthened j but the Pith
e has ceafed. It comes to an abfolute termination, in an obtufe form, as in the other
inflances; and after a fpace is left, Fig. 3, i a new Pith is generated in the afcending
Shoot, the fame in texture, form, and colour with that below ; but, as has been juft
fliewn in the other inftances, perfedlly difunited from it. The new Pith therefore is
not a continued growth of the old; but a fubftancej produced, as that had been,
from the other parts.
In this Maple the Pith has kept Its eylindric form throughout, and not thickened
Fig. 4. at the end with the fwelling of the top of the Shoot. In the Pine, Fig. 4. where that
fwelling is greater, as it only affeits the exterior parts, a greater fpace is left within
Fig. 5. than in the former. Fig. 5. but if we fplit fuch a Shoot, we find 'tis not a vacancy
that is left ; the Pith fills the larger hollow as fail as it is formed; for 'tis only at the
extenfion in length that its courfe ceafes.
In the Plane Tree, where the difpofition of the Pith is more irregular than in many
Fig.6.7. a other kinds, wherever the cavity extends, as at Fig. 6. and 7. a. the Pith always goes
with it J but ftill at the place where the Shoot of one feafon ceafed, and that of ano-
^ ther begins, there is a fpace between the Pith of the former, and that of the latter
^'g* Shoot b. And even in the Turpentine Tree, Fig. 8. where this fpace is lefs than in
Fig. 9. <3 any other which has come under my obfervation, ftill it is a fpace, as at Fig. 9. a.
and the Pith of the preceding Shoot ends in the ufual obtufe manner, where the be-»
ginning of that of thp young Slioot, altho' diftina, is yet irregujar,
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B O O K
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