( S. ) 
nues throughout the whole thicknefi of each Mufcle. As to 
the circular Fibres fpoken of by Dr. Moulins , I do not know 1 
law any, neither do I th.nk them necellary for pulling up the Trunk, 
or deminilhing it as to its length : For the great diilance betwixt 
the Origin cf thefe Mufcle3, and their Inlertion at the Extre- 
mity of the Trunk, the longitudinal Pofition of their Fibres till 
they come to make a part of it, and the fpace they have to ad: 
it, and to fmell their Belly, and their oblique Jnfcrtion in thefe 
tendinous Lines, may be look’d upon as fufficient to perform this- 
motion \ and ’tis obfervable for this end, that the Skin is divided 
into feveral Plica or Linbs-, as we fee in a Worm, when hie draws 
up and Ihortens herfelf Thus I conceive the forenam’d Faftiutli 
may at the beginning extreamly begin to be contraded, then the 
T a fcicnli next to them, and fo in order till they come to the 
Root of the Trank ; by which fucceffive Contractions the Bellies 
cf all the Mufcles begin to fwell, and fo their Fibres diminiih as 
to their length : And there needs no more for ftretching forth 
the Trobofcis thus contraded, but the Fibres to relile to their 
former Pofition •, which it may do with the fame fwifenefs, as we 
fee a Bow doth by its Elafticity when once it is fhot. 
Thefe Mufcles furround two large Cavities 2 Inches Diameter Tk Cavitm 
from the Right te the Left, and 3 Inches each from above to of the Pro- 
below, about the middle ol the Trobofcis \ for as they proceed bolcuv 
from the Scull they are very wide, according to the Capacity .of 
the Hole in the fore part of the Scull, whence the Trobofcis pro- 
ceeds ; of which hereafter. They are divided by a ftrong earn - 
laginons Septum, which runs lireight from before to behind, along 
the middle of the Trobofcis. This is the Septum whercinto the 
Mufcles fituated in the fore and back part are inferred. Thele Holes, 
are Cartilaginous, all round obduced with feveral Nerves, where- 
of hereafter ; and endued with a great many Glands for fcgara- 
ting a certain Mucus , wherew-ith the inner Surface is always, 
bedew’d, to keep it moilt and preferve it from injuries of the. 
Air it fucks in at Breathing. Thefe two Cavities are of greax- 
ufe, for they draw up and contain as much Water as ferves the 
Animal at once, which afterward it emptieth into the Mouth, 
as it were from a Tunnel : They ferve alfo for Breathing, Smel- 
ling, and uttering the Voice. The Trobofcis is not equally great, 
but from 38 Inches in Circumference at the beginning,, it be- 
comes gradually fmalier till it be 20 Inches at the middle,, and 
a? the Extremity ti Inches, It has an hollow Carriage, w.her®L 
