C *75 ] 
bilitari truncum aorrae, et ad aneuryfmata reddi pro- 
num. Demonrtrat etiam, in ipfo fanguine ubiquc 
terram vcram calculofam circumvehi, nec in rena- 
libus folum viis deponi, fed ibi hzerere et congeri, 
ubi ruptae funt leviffimae membrantc vaforum, et at- 
tradtio rerrearum molecularum ad afperas inxqualcs 
fuperficies major eft. 
XVI. A Memoir on the Lacrymze Batavicae, 
or Glafs-Drops , the tempering of Steel, 
and Effervefcence, accoimtedfor by the fame 
Principle . By Claud, Nic. le Cat, M. D. 
F. R. S. See. ‘Tranflated from the French, 
by T. S. M. D. 
Read June 15. | ^HE Glafs-Tear, or Drop, comfnonly 
1749 ‘ JL called Lacryma Batav'ica, or La - 
cryma Borujjica, becaufe it was firft made in thefc 
Countries, is much celebrated among Natural Phi— 
lofophers, upon account of the lingular Phoeno- 
mena which it exhibits, and which have for a long. 
Time exercifed their Sagacity. 
The Make of this Drop is as limple as its Ex- 
planation is difficult. It is the W ork of the meaneft: 
Workman in a Glafs-houfe. On the Top of an 
iron Rod they take up a fmall Quantity of the Mat- 
ter of Glafs in Fulton : They let it drop into a Pail 
of Water : The Drop makes that Part of the Water 
which it touches, to boil with a hilling Noife, as a 
red-hot Iron would do, which it refcmbles in that 
Inftantj and when it does not break in this Ope- 
ration, 
