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Page 2

HARVARDMEDICAL
LIBRARY

RONTGEN

THE LLOYD E. HAWES
COLLECTION IN THE

HISTORY OF RADIOLOGY

<?^ Harvard Medical Library
in the Francis A. Countway
Library of Medicine -Boston

VERITATEMper MEDICIXAMCIU>€RAMUS

Page 42

C 24 ]
permit the Eledricity to pafs through
them ; therefore when you would have
this Experiment fucceed, the Finger
of the Perfon, who is to fire them, is to
be applied as near to the Edge as pof-
fible of thefe Subftances when warm'd
in a Spoon, that the Flafhes from the
Spoon (for thefe Subftances will emit
none) may fnap, where they are
fpread the thinneft^ and then fire their
Efiluvia. This Experiment, as well

as feveral others, ferves to confute

that Opinion, which has prevail'd with
many, that the Eledricity floats only
upon the Surfaces of Bodies.

If an eledrical Cake is dipp'd in
Water, it is thereby made aCondudor
of Electricity, the Water hanging a-
bout it tranimitting the eledrical Ef-

fluvia infuch a manner, that a Perfon
ftanding thereon can by no means be
eledrified enouo;h to attract the leaf

Gold at the fmal left Diftance; though
the Perfon ftanding upon the fame

Cake

Page 43

[ ^5 ]

Cake vv^lien dry, attracted a Piecd of
fine Thread hanging at the Diflance
of two Feet from his Finger. We
mud: here obferve that the Cake being
of an undluous Subllance, the Water
will no where lie uniformly thereon,
but adhere in feparate Moleeulse ; fo

that in this Inftance the Eledlricity

jumps from, one Particle of Water to
another, till the Whole is diffipated.

From the Appearance of the
Threads amongft which I rub the
Tube, I can frequently judge, though
the Spirit may be many Feet diftant
from thenij whether or no it will fire;
becaufe when the Perfons ftanding up-
on the Wax are made eledrical enough
to fire the Spirit, the Threads repel
each other at their lower Parts, where
they are not confin'd, to a confidera-

ble Diftance, and this Diftance is in
Proportion as the Threads are made
eledrical.

D f

Page 83

COUNTWAY LIBRARY OF MEDICINE

QC
516

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