and found its Square Root ( oE 27 places ) to be 
15-7, 1030, 1(587, 14S2, 805-8, l7ifi 2.171, fere, 
(Without any other Method of extrading I^ots, than 
what is commonly taught in Books of Arithmetick J 
Thefe numbers, (having fixed them in my Memory, 
by repeating the fame- Operation a night or two af- 
ter,^ when he made me another vifit, March the ir 
following, I did diitate to him from my Memory, 
^having not, tefore, committed them to writing^ tor 
him to write down and examine: And did, after- 
wards^ write them down my felf. 
He did it feems, difcourfe this afterwards fat London) 
with M'' Oldenburg (by whom he had before been di« 
reded to me , ) to whom (as I remember) upon a Letter 
- from him, I gave a like account as now I do. 
I will not undercake, that my Memory is now fo 
ftrong, as then it was, in my younger days : but do be- 
lieve, if occafion were, I could yet perform the like* 
But I have never tryed it (in fo great numbers^ fince 
that time : Being by that time, fufBcientiy latisfyed, 
that, a reafonable good Memory, fixt with good atten- 
tion, is capable of being charged, with more than a 
man would at firft imagine. 
The Second ExtraB. Dec, i^th. 16% 
A Model, or pattern of a Stone^ which came from, 
the Bladder of M". E.V, oi Wallingford, at the 
age of 61 years, jlug, 7. '^6%s> was communicated tp 
the Society, The compals of it was ^\ inches ; the length 
4| inches, the weight 3 ounces Avoird. This Stone was 
at its coming off, taken out by her Husband, with- 
out-the help or Inftrument of Phyjtcianot Cbirurgeon^ 
and without effufion of Blood ; fince its coming off, 
ftie has been troubled with UriniB incQ7itinentia. 
X X X Fart 
