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putting it upon a Table, in about a Quarter of an 
Hour it broke in Pieces. 
Into a third Bottle I dropped a Piece of Wlietftdne, 
weighing 40 Grains and in fome few Minutes the 
Bottle was broken. 
I filled another Bottle half-full of Water, and let 
fall ihto it a fmall Piece of Flint ftone 5 and after 
four Hours it burft. 
I let fall into three other Bottles a Piece of Wood 
weigh trig 50 Grains, a Piece of Brafs weighing 300 
Grains, and a Bail of Lead weighing 140 Grains 5 and 
neither of them was broken. 
Thefe Bottles are thicker at the Bottom than the 
Neck. The Giafs-Maker blows them, and lets them 
cool, without putting them again into the Oven. 
And, from the Experiments, I take notice, that what 
. is capable of breaking them ought to have fome 
Roughnefs: And I am told that a Grain of River- 
Sand will break them. 
The firft Opportunity I (hall fend you two or more 
of thefe Bottles j and am, &c. 
X. A Letter from Mr. Tho. Wright to James 
Theobald, Lfq\ F. R. S. concerning Two 
ancient: Camps in Hampfhire. 
Read Feb. 7. IT AST Summer, during my Stay in the 
1744 1 j W eft of England , common Report, 
and my own natural Curiofity, led me to a Place 
in Hampfhire called Buckland Caflle , or, more vul- 
garly, the Rings j where I found two neighbouring 
Mm2 Camps 
