( 100 ) 
into the Orifice you may inflate the Dura Mater ; as was 
done by Mr. Dobyns a Surgeon, in a Cafe of this Na- 
ture. The Coat of the Tumour confided at its Bafis of 
the Cut kith. Cutis , and Membrana Adipofa: the two firft of 
which forthwith terminating, the Cuticula only was con- 
tinued ; immediately under which appear’d the Mufcles 
and Fungus above mention’d. In this it differs from 
thofe of Mr. Ruyfch, which received their Coats from 
the Membranes that cover the Medulla: as likevvife 
from thofe taken notice of by Tulpius, which borrow’d 
theirs from the Peritoneum, as he fays; tho’ by his own 
Description, it is more likely they proceeded from the 
fame Membranes. 
Thefe Tumours conflantly attend the Spina Bifida*. 
infomuch, that when any of them prefent themfelves 
on the Loins or Back of a new-born Infant, we have 
good grounds to pronounce This to be the Caufe; but 
we may be pofitive in it, if the Child can't move its 
lower Limbs ; the want of which motion is an infal- 
lible Indication , that the Medulla Spinalis reaches no 
farther than the Swelling, whereby the Nerves are 
not diftributed to thofe Parts. They appear diffe- 
rently in different Subjects. In fome the whole Tu- 
mour is Opahe ; which proceeds from fmall Filaments of 
Nerves propagated in great numbers throughout its 
Coat, and not from the thicknefs of the Skin, as Ruyfch 
will have it. In others it is pellucid ; and then the Me- 
dulla terminates at once at the Aperture of the Spine , 
and does not fhoot out into any Ramifications. This 
before us is a Compofite of both Species, the greater 
part of which was pellucid ; the lels, viz,, the Apex, 
cpake. 
The Back-bone itfelf, you may obferve, is not cleft, 
but has its Vertebra, with their other Proccffes entire, 
and is only defe&ive in its Spines or Acute ones. But 
that 
