[ 5i5 1 
That of the two Phials rubbed with the Finger on 
the Infide of the Hollow, the one did not break, 
but the other did, about five Minutes after. 
' That one of them did not break with the Fall of 
a. rough Cornifb Diamond into it, tho’ the Experi- 
ment was twice repeated ; but that the fame after- 
wards was immediately broken by the Flint. 
That the Trials made upon English Glafles, tho’, 
feemingly, of the fame Sort, did not fuccecd quite 
fo well, and fo certainly, as thofe made upon the 
foreign ones ,• which were, probably, more fuddenly 
cooled, as the Workmen already acquainted with 
their Properties, may be more expert in their Manage- 
ment of them. 
Upon the Whole, all the Company were perfectly 
fatisficd of the Truth and Exa&nefs of Monfteur Al- 
lamand’s Experiments; and order’d their Thanks to 
be recorded both to that Gentleman and Mr. Ben - 
tinck , for thefe very curious Communications. 
Mr. Allamand obfcrves, that he had yet only- 
tried thefe Experiments upon Phials made of white 
or cryftal Glafs. But the Prefident fince received 
from the Reverend Dr. Littleton , F. R. S. fome large 
hollow Cups, made at IVorcefter , of the common 
green Bottle Glafs ; all which, tho’ of a much greater 
Size than the others, and fome of them above three 
Inches thick at Bottom, were inftantly broken with 
a Shiver of Flint weighing but about two Grains ; 
tho’ they had before relifted the Shock of a Musket- 
ball from the Height of near three Feet. 
U u u z 
iV. B. 
