Royal Society. 43p 
Foramen within the middle of the Nucleus 'Pyramidal/ s of the 
Cochlea accompanied with a fmall artery and vein 5 and as foon 
as It comes out of that Forame/i^ its fine membrane is expanded 
in fuch a manner, as to line what is convained between the fe- 
cond winding oF the fpirai Lamina^ of the Nucleus '\PyramldaUs 
of the Cochlea^ which is partly bony, and partly nervous, to 
the extremity of the Cochlea itfelf; its medullary fubilance ter- 
minates m the third winding of the Lamina Spiralis^ which is 
entirely nervous, and the circumference of this winding refts 
upon, and adheres to, the orbicular Apophyfis of the Cochlea ; 
and at lafl, its extremity is expanded into a fmall membrane, 
which being rolled up a little, is applied and adheres to the 
edge of the Cellula^ excavated in the middle of the extremity 
of the Cochlea^ and fo forms a fmall cavity, refembling a little 
clofe cup. 
From what has been faid it appears that the fpirai Lamina 
within the Cochlea^ confifts only of two windings and a half^ 
which are diftmguilhed from one another by fmall cavities re- 
pienifhed with mnate air, and between which there is no vifi- 
ble communication : Here it is to be- obferved that the fpirai 
Lamina furrounding the pyramidal Nucleus of the Cochlea^ as 
alfo the femi-oval fpirai Lamina^ within the femi oval fpirai 
duct of the Cochlea.^ together with the fmall nervous mem- 
branes that line the internal fuperficies of the three femi-circu- 
lar duds, are furniflaed with a very limpid fpirituous liquor, 
particularly in new-born children, which upon laying open the 
Cochlea becomes vifible to the naked eye, and foon evaporates; 
the interior or medullary, and truly nervous fubllance of the 
faid Lamiride is foon dried up, and becomes very friable when 
cxpoled for any time to the air, as was above obferved : 
From what has been faid of the Tortio Mollis^ or foft branch 
of the fcventh pair of nerves, Vieujfens thinks it plain, that 
the above defcribed two nervous fpirai I^amifice, together with 
thofe of the Concha, within the three femi- circular dufts, con- 
ftitute the immediate and complete organs of hearing • fo that 
according to the different motions excited by the objefls of that 
ienfe in the animal fpirits, lodged in their pores, and com- 
municated to the common Senforium, different ideas cf found 
are produced in the mind. 
A-i 
