how to produce and preferve . i o I 
. The fame Thing likewife happens to 
Saccharum Saturni, Ens Veneris, Salt of Am¬ 
ber, and fome other faline Subftances, whofe 
elegant Configurations may be long preferv- 
ed between Slips of Glafs kept afunder as 
above directed, provided the Air be not pent 
up with them, and that the Place you put 
them in be dry* I have at this Time feve- 
ral Configurations formed fome Years ago ; 
and it will fave much Trouble, and be mod; 
agreeable to People not overfhock'd with 
Patience, to have always as many kinds as 
one can thus ready, to fhew fuch Friends 
whofe Curiofity may not be fufficient 
to make them attend to the whole Pro- 
cefs. 
A great deal of Exadtnefs and Nicety is 
requisite as to the Degree of Heat, to make 
one and the fame Drop produce all the Con¬ 
figurations prefented in the Plate j tho’ you 
will certainly meet with feveral of them in 
every Drop you try, unlefs the Heat be too 
long continued; in which Cafe the Fluid 
becomes hardened by the Fire into a kind 
of tranfoarent Gluten, which never fhoots 
at all, is not eafily diliolveable, or to be got 
off the Glafs without fome Pains. On the 
other hand, if the Pleat be violent, though 
not long, it fhoots too fall;, with much Ir¬ 
regularity and Confufion. 
H 3 
The 
