( Jll ) 
opinion they have been, in fome Particulars at leaft, mt- 
ftaken. I fhall mention fbme of thefe. 
The learned and curious Enquirer into Nature, 
Monf. Perault , defcribes it after this manner *. 
This long Tongue he throws out by the means of two 
fmall bony Cartilages, about feven Inches long, and of 
the thicknefs each of a middling Pin, which are per- 
fectly Smooth and Slippery. Thefe two Cartilages arc 
united at the End, and being in this place covered with 
Flefh make the fore-part of the Tongue. The reft of 
thele Cartilages are. feparated from each other, and pals 
turning round under the Ears; and then rifing up behind 
the Head, where they meet again, they pafs over 
the Top of the Head, and fo extend themfelves to the 
Root of the Beak. Thefe Cartilages which make the 
hinder part of the Tongue, are alfo inclofed in a Chan- 
nel Fiefhy on the out- fide, and whofe infide is covered 
with a very fmooth flippery Membrane. 
Now thefe Fiefhy Channels, which incompafs and keep 
in thefe Cartilages, are the Mufcles by which the 
Tongue is moved : for having their origine at the La- 
rynx, and their infertion at the extremities of the Carti- 
lages, it comes to pafs, that when thofe Mufcles of the 
two Fiefhy Channels, which make the hinder part of the 
Tongue are Ihortned, they force the fore-part of the 
Tongue out of the Beak, by drawing the pofterior or 
fartheft end nearer to the Larynx : and on the contrary, 
when the Fiefhy Channel which makes the anterior Part 
ads, it draws the fore-part of the Tongue into the Bill 
towards the Larynx. 
This Mechanifm of making a hard parr, fuch as the 
bony Cartilages are, to come out and return into another. 
* EJfays as Lhyjicjue, Tom. 5. Part 2. p. 148. 
K k k k i fuch 
