( f' ) 
out again, that Periftaltick Motion being always for- 
ward. One of thefe Stones being thus enter’d, ’t is eafy 
to conceive more may be admitted, fince the firft car.’ 
not but dilate the Paffage for another that follows, and 
fo on till the Cavity be full* Whilft thefe Stones lye 
there, they muft be conceived to offend the part, as 
having extended it beyond its Natural State : So that 
the Secretory Du&s of the Gland, of which the innet 
Coat of that, as well as the reft of the Inteftincs, is 
conftituted, muft be proportionally dilated $ whereby 
an eafier way is made for the Liquor, they feparate, to 
be excreted. This being of a vifeid and concrefcible 
Nature, muft, fince it cannot get forth, be prefum’d to 
adhere to the SnbflratnM, the Stones, and fo by degrees 
Incruft them $ which Cruft by the long confinement 
muft grow fo much thicker, for the fame reafon as it 
began, the Du&s being kept conftanly open, and the 
Cavity more and more dilated the greater the Inqrufta 
tion is. So that I conceive the Symptoms are eafily 
accountable for, from the offence given to the part, 
which being fenfible, as all membranous and fibrous 
Parts are, the Pain muft grow greater, the greater the 
Extenfion is ; and the change of the Pofture of the 
Tumor may very well be conceived to proceed from 
the different Poftures the Inteftincs put on, by the Chyle 
or Excrements palling along them, and fometimes fill- 
ing one part, fometimes another, as they are protruded 
further and further, their Lubricity on the Surface, 
length, and confinement obvioufly favouring that Phe- 
nomenon. I am of Opinion, the true Bezoar Stones are 
form’d in the Beafts, that yield them, in the fame mari- 
ner but whether their Stomachs or Inteftines have o- 
ther Cavities Capable of receiving and retaining them to 
their full growth, is to be determined by Anatomy. 
This I think is certain, that all of them have either a 
Straw, Stick, or other Subftance different from the Ex- 
E 2 terior 
