24 hours without food. An ab/lraSi of a Letter 
/ro/T/Mr.Heathcot/o Mr. J. Flamfteed Aftron.Reg. 
from Cabo Cors Caftle on the coajl of Guiney Dec. 
14, I 6S^. concerning the Tide on that Coaft, Va- 
riation the Needle^ &c. An account of aBook^ 
Martini Lifter M. D. e S. R. Lond. de FONTIBVS 
MEDIC AT IS Angliae, Exercitatio altera. Londi- 
ni. inOdiZv. 1684. 
A Letter from the learned and ingenious Mr. Will Molyneux Secretary 
to the Society of Dublin, to Will. Mufgrave L. L. B. Fdloiv of 
New CoUedge, and Secretary to the Philofophical Society of 
Oxford, for ad'vancement of natural Knowledge ; concerning Lough 
Neagh Ireland, and /^j petrifying Quali tys. 
SIR, ^ 
IN Anfwer to the Oxford Society s Query concerning our Lough 
Neagh and its Petrifying Qualitys, I make this return. 
I. That it is generally agreed by all the Inhabitants there- 
abouts,that it has that Quality, but yet I have a Letter bv me 
from a Gentleman (unknown to me, and therefore I will not 
promife for his Credit or the Fidelity of his enquiry ) that 
that pofitively denies that there is any fuch thing, but aflerts 
tha^t the Stones^ that are brought to us as fetryfyd Wood, are 
found deep in Sand Hills in the Country adjoyning to the Lough^ 
alledging as an experiment, that a Gentleman of his Acquain- 
tance,fl:uck an Oak^flake into the Lough twenty years ago, which 
there remains unalter'd. But I conceive this Aflertion to be 
without ground, and the experiment's falfly made , For firlt 
'tis agreedby all that no JVaod will Fetrifie in this L^;/^i),except Hol- 
ly y(o that his applying an Oak Bake was improper ; Seconaly,for 
their being found in Sand HtUs^ they may eafily be fuppofed in 
procefs of time to have been brought thither, and left there : 
for I do not find he aflerts that they are found fo deep inthofe 
iMs that have not been dug up 3 and thirdly, it is with fome 
probability aflerted (and I have a Letter from an underftan- 
ding Perfon thereabouts confirming itj that the Larth about 
Lough Neagh has this Petrifying Quality, and we may well imagine 
thatthefe fand Hills efpeciaily, are not deftitute thereof; 
