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130 E X P L A N A T I O N OF THE TABLES.
T A B L E XIIL
^^^LL the Figures of this table (except the laft, viz. Fig.
15.) reprefent the appearance of the nerves of man, quadrupeds,
birds, amphibia, iiflies, when carefully viewed with
the naked eye, or with a magnifying glafs.
FIG. I. II. III. IV. Reprefent the human nerves.
The uppermoft dehneations In Figui'cs I. and IV. reprefent fmall nerves of
an adult, and the uppermoft delineation in Fig. III. reprefents the trunk
of the anterior crural nerve of a child.
The delineations placed immediately under thefe reprefent the fame nei'ves
viewed with a magnifying glafs.
Fig. II. Reprefents part of the fciatic nerve of a child viewed with a magnifying
glafs.
The third delineation of Fig. I. fhews the change of appearance produced
by ftretching the fame nerve moderately.
The fourth or undermoft delineation in Fig. 1. fliews the fame nerve
ftretched as fully as it can bear, without being lacerated.
The nerves, when ftretched, not only become fmaller, but the ferpcntine
turns which they feem to make when relaxed, become, as the degree of
tenfion is increafed, lefs and lefs obfervable till they difappear.
FIG. V. Reprefents, of their natural lize, two fmall nerves of quadrupeds
; the uppermoft is from a dog, the undermoft from a flieep.
FIG. VI. VII. VIII. Reprefent the nerves of fowls, of the natural fize
and magnitude.
FIG. IX.
XB. XLH