Blue Vitriol . 77 
at the Beginning, but increafing gradually 
as reprefented Plate II. (in the Drawing 
called Blue Vitriol) at the Figures 1, 2, 3, 
which denote their Difference of Form, and 
the Progrefs of their Growth. Thefe cryf- 
taline Shoots are folid, tranfparent, and 
regular, and refledt the Light very beauti¬ 
fully from their polifhed Sides and Angles. 
As the watery Part evaporates. Numbers 
of long flender Bodies refembling Hairs 
are feen here and there, fome lying Side 
by Side, as it were in little Bundles (vid. 4.) 
and others croifing one another, in fuch 
manner as to feem all radiating from a 
Center, and compofing ftar-like Figures, 
which fee at 5, 5. This Salt proceeds but 
flowly, and requires fome Patience before 
the Configurations begin to fhoot: which 
they do at laft, and that towards the Middle 
of the Drop mofl commonly, after a very 
pretty Fafhion, as at 6 ; and it is to be ob- 
lerved, that here alfo the principal Lines 
iffue from a Center. Any farther Defcrip- 
tion of the Drawing feems unneceffary : but 
it is remarkable, that none of the regular 
Cryftals are found in this Way of Examina¬ 
tion, though they are to be obtained in 
good Plenty by the ufual Method of Eva¬ 
poration, &c. 
One of thefe regular Cryflals, of the 
Size they are commonly found in the Shops, 
is reprefented by the two Figures A and B, 
which 
