[ i 7 8] 
brown Hue 5 which is the Cafe of fuch as have been 
already lodg'd in the Cavity of the Stomach, when 
the Fifh was taken. They likewife cat the old Shells 
immediately after {bedding them *. What theUfe 
of thefe Stones to the Creature is, he cannot pofi- 
tively determine, but fuppofes they may be de- 
hgn’d to furnilh new petrefeent Juices to its Fluids; 
which may be alfo aflifted by the old Shells which 
they devour, the Particles whereof, as well as of 
the Stones are probably difpos’d of, according to their 
Degree of Purity, and properly depofited at the Ex- 
tremities of Veflels, for the Reproduction of their 
annually new crufty Drefs 5 which, he obferves, 
does not greatly recommend the Opinion that thefe 
Stones have a diffolving Quality, of Service againft 
the Stone in the human Kidneys or Bladder. 
The Doctor has fent along with this particular 
Account, Specimens of the Cray'-fifh both boil’d 
and raw, which differ little or nothing from thofc 
catch’d in our Rivers here j in which I ana allured 
the like Concretions may be alfo found at a certain 
Time of the Year : He has likewife fent me fornc 
of their Stomachs dried, where the Stones appear 
Etuated in the manner above deferibed between the 
two Coats; and in one of them they are got thro* 
the internal Coat into the Stomach itfeif. I received 
alfo from him feveral Specimens of the beginning 
Scales, 
* I have obferved the fame thing in the fmall frefh Water 
Shi imp ; which I have kept in a Glafs with Water throughout 
feveral of the Periods of its carting its Shell, which it does once in 
about a Month or five Weeks. The Water Newt alfo eats its 
Skin as foon as pull’d off, if it be not taken away. 
