In the third and laft Book, our Author gives fome 
farther account of the Cochinele, proving it to be of ani- 
mal produdHon, and that it is not any of Bnglifi Lady- 
cow, as fome have affirm’d : The Glojfopetra he believes 
to be the petrified Teeth of Sharks. Concerning the 
Serpentine Jlone, lie takes notice of the difference in 
Authors about it, viz. whether it is a Natural or Ar- 
tificial production, and whether it hath the Virtue to 
expel Poifon in Venemous bites or not ? He enume. 
rates the feveral aflertions of the Learned pro & con , 
quoting divers of their Experiments, and at laft con- 
cludes, that both Natural and Artificial are to be met 
with, and that the different operations rnuft arifc from 
thence. Pedro del force our Author affirms to be only 
an JEgagrepila found in the Stomach of a Porcupine. To 
thefe he adds fome Obfervations taken from F. Camilii 
his Papers, not only concerning this Stone, but like wife 
Bezoars. The whole Book abounds with many Curious 
Obfervations, for the farther dilucidation of the Mate- 
ria Medica, which we recommend to the perufal of the 
I Curious. 
London, Printed for Sam. Smith and Benj. Watford, Printers 
to the Royal Society, at the Princes Arms in -St Battik 
Church-yard , ijo6» 
E R R A T A. 
' 
In Fhihf. TranfaS. R 305, Fige a jgy. Line 31. lead mil VUU as v'st! os IX. 
