1 4 Method of preparing 
are formed into Cryfkals, but even whilft they 
are adting : and this what I call their Con¬ 
figuration does moft wonderfully fliew. 
My Intention was to difcover as far as 
might be, the natural Inclination, Progref- 
fion and Figure of each refpedlive Salt under 
Examination ; it was confequently necefiary 
to avoid making ufe of any Diflolvent, which 
by containing other Salts might create Con- 
fufion, and produce Forms not conftant or 
efifential to the Subjedt of Inquiry. River or 
Rain Water has therefore moil: common¬ 
ly been my Difiolvent, being what I judged 
leafi: likely to prejudice my Experiments. 
I am very fenfible neither Salts or other 
Bodies are to be obtained unmixt and per¬ 
fectly homogeneous : but I have taken Pains 
to procure fuch of each Kind, as appeared 
moft pure and perfect, I mean of the fim- 
ple Salts; as for the Compounds I was 
obliged to rely on the Chemift. 
In all Examinations by the Microfcope 
of Saline Solutions, even though made in 
the Day-time, I always employ the Light 
of a Candle, and advife every Obferver to 
do fo likewife : for the Configurations be¬ 
ing exceedingly tranfparent, are rendered 
much more diftinguifhable by the brown 
Light a Candle affords, than by the more 
white and tranfparent Day-light and be- 
fides, either by moving the Candle or turn¬ 
ing the Microfcope, fuch Light may be 
varied 
\ 
