[ * 5 } 3 . 
Pot would have continued to have (hot frelh Nitre 
much longer, if I had not had urgent Ufe for it, to 
make other Experiments in. However, it is to be 
obferved, that I had already gathered more Nitre than 
I put into the Pot at firft j though, as I faid before, 
for what I could perceive, I had taken all or near all 
the Nitre that I firft put in together with the Sulphur, 
out of the Pot in a Lump. Hence we may have fome 
Conceptions of the Nature of mineral Earths, and 
how they grow and increafe, when once impregnated 
with the Seeds of a Mineral. This likewile is a 
Proof of the Quantity of nitrous Particles with which 
the Air abounds, fince the large Quantity of Nitre 
which I colledled out of the Pot, when left etnpty 
upon the Shelf, could be fupplied by the Air only. 
JV. B. Thefe three Experiments are all that I could 
fave intire out of a great Number which were fent 
to the Hon. Mr, Boyle^ in Anfwer to a Letter from 
him to Ml. John Clayton., containing 17 ^^ore’s. 
Robert Corke. 
yil. Extra£i of a Letter from John Rutty, 
M. 2). to 2)r. Mortinaer, Seer. R. S. cow- 
eerning the Poifon of Laurel-Water. 
^ear lDo 5 ior, ‘Dublin, May 17 . 1732 . 
I Received thine of Feb. t f. with the TranfaCtions 
N^4i8 and 420. giving an Account of the Ex- 
periments upon Laurel-fVater. I wifh your Experi- 
ments 
