C S°S ] 
greater than that of the Mucilage of Bailey. Taking 
therefore three Fourths from Thirty-fix, the Force of 
the Mucilage, the Remainder nine is the Force with 
which the Mucilage will impel the Stone j and, 
confequently, the impelling Force of the Mucilage, 
in the Neck of the Bladder and in the Urethra , will 
be nine times greater than that of Urine; befides 
the Advantage of greater Siipperinefs which it gives 
to the Urethra. 
III. An Account of fome Experiments , lately 
niade in Holland, upon the Fragility of 
unannealed glafs Veffels \ communicated to 
the Prefid ent. 
Read oss.. 3 L -'"~T^’HE fol lowi ng Paper contains the Ac- 
,/4S ’ count of feveral Experiments of an 
odd Nature, that have lately been tried both in Italy 
and in Holland, upon fome unannealed glafs Phials; 
that is to fay, fuch as have been expofed to the 
Air as foon as blown, without palling through the 
Operation that is commonly called Annealing. 
The exceffive Fragility of thefe Sorts of Glafi.es 
muft have been obferved, as long as the Art of making 
Glafs has been in Ufe: it having been found, that 
almoft all the Vefiels that were made of fuch Glafs 
were entirely ufelefs upon that Account j as being fub- 
jett to break and fly, almoft conftantly, of them- 
felves, and that even frequently before they were 
well cold. 
It was therefore to remedy this Inconveniency that 
the Pra&ice of Nealing or Annealing them was de- 
Ttt vifed; 
