59 
though I have made a very loud and harth 
noife aboutthem. I find, however, that many 
creatures, to whom authors have denied this 
faculty, enjoy it perfectly ; for example, the 
G H A 
The BOOK of NATURE; of, 
Camelion. JI have likewife obferved that 
Frogs and Fifhes have this fenfe; nay, Fifh have 
a wonderful labyrinth of the ear for that 
purpofe. 
Pye 
Of the firu€ture and ufe of the verge or lip of the Snail, and of its refpiration 
and voice, with other experiments : allo of its glands, veffels, and what it ha 
in the place of feet. 
AVING defcribed the eyes, mouth, 
and teeth, and treated of the fmell and 
tafte of the Snail; it 1s proper I fhould now 
treat of the aperture, through which the parts 
of generation occafionally difclofe themfelves. 
This I thall confider, when I come to {peak of 
thofe parts themfelves, but previoufly to that, 
I fhall fay fomething of its lip, or the flefhy 
verge at the head, and of the apertures in it, 
as alfo of the fringed margin of the body, and 
the little excrefcences vifible on thofe parts, 
and of the veffels that run between them. 
Tab. IV. fig. 1. The verge that furrounds 
the whole body of the Snail is not fo broad 
within as on the outfide, and is connected very 
clofely to the extremity of the fhell both in- 
wardly and outwardly. As this is provided 
with a great number of mufcles, it accordingly 
acts with various motions, fuitable to the dif- 
ferent intentions of the Snail. Hence it is, that 
its true figure cannot be determined, for it is 
continually contracting, expanding, and chang- 
ing its form. Where it is annexed to the 
upper part of the Snail’s body, it exhibits two 
fingular incifions like two little tongues; and 
underneath the right fide of the belly, it has a 
remarkable aperture, Tab. IV. fig. 1. g, which 
ferves to take in air; befides which, it has 
another f, whereby the faeces or excrements are 
voided, as if by a {mall, oblong and curled in- 
teftine. The colour of this verge is white, 
with certain yellow {pots, grounded, as it were, 
on a pale tranfparent green. On the infide, 
where it is joined to the fhell, it is of a black- 
ith colour, fomewhat approaching to blue. It 
has different ufes, as appears both from what 
has been hitherto faid, and from what I {hall 
hereafter obferve, when I come to treat at large 
of the Snail’s bone. 
On the infide, this verge is arched, as it were, 
and reaches with its cavities upwards, towards 
the pointed extremity of the body, to the 
windings of which, thefe cavities are adopted. 
Above, in the inward furface of the border, there 
are feveral veins, Tab. V. fig. 1v. ¢, which 
run there naked: or uncovered. But below in 
its cavity, almoft underneath, on the left fide, 
and in the declivity of the body, is placed the 
heart c, which may be feen tobeat, even through 
the external fkin, before that part is taken off: 
I have therefore marked its figure from the 
origin with points, Tab. V. fig. iv. 2 This 
heart and its veins are continually refrethed 
with the air, which the Snail impels into it 
through the aperture of its verge, Tab. V. 
fig. 1v. 6: for as the Snail rolls its body out of 
the fhell, fo in proportion it drives the air into 
the cavity of its verge; and again, according 
as it draws back its body into the fhell, fo it 
likewife expels the air from thence. This may 
be efteemed fomething analogous to refpiration, 
as I have fhewn in the year 1667, in my 
treatife on that fubject, and exemplified parti- 
cularly in the cafe of the garden Snail. 
When the Snail has crept out of its fhell, and 
is put into water, the air contained in the cavity 
of this verge makes it {wim on the furface ; 
but when the Snail is within its ftony fkin, 
and the cavity of its verge is clofed and com- 
prefied, it finks to the bottom, if it be thrown 
into the water. But if the Snail, as it lies in 
the water, creeps again out of its fhell, the 
cavity of the verge is immediately filled with 
the water rufhing into it, which then does the 
bufinefs of air, which would have been im- 
pelled thither; hence it happens, that by a new 
kind of refpiration, this water is fometimes 
moved within and fometimes without the fhell, 
according as the Snail rolls its body out, or 
draws it into it. 
The Snail has no voice, nor makes any noife, 
except that it produces a kind of hiffing when 
touched with a ftick, or any thing elfe, and 
faddenly draws in its body; for then, as the 
aperture through which the air is conveyed, is 
in a manner ftopt up, it cannot readily get 
out ; and this caufes the hiffing found. 
Sometimes it happens that, do what we will, 
we cannot get the Snail out of its fhell, in 
order to make this experiment, by which we 
might fee that the air is forced into and out 
of the body, through the aperture of the verge. 
But if you have a mind to make the experi- 
ment, and obferve in what a wonderful man- 
ner this aperture then fhuts and opensitfelf, you 
mutt ftrike the fhell a little on the hinder part 
with the back of a knife; then immediately 
the Snail, compelled to it by the pain that it 
feels, will creep forward, and will plainly thew 
the opening thraugh which the air pafles, toge- 
ther with the manner of its refpiration. 
The extreme fringed margins of the body 
are planted as it were with numerous glandu- 
Jar tubercles or excrefences, Tab. IV. fig. 1. B54, 
from 
