[ 5 °° ] 
ing fome of them fquares, others longifh parallelo- 
grams, others irregular pentagons, and fome with 
fix fides ; fome were flat, and from T ‘_ to f , or 7 of 
an inch thick others appeared fomewhat roundifh, 
or oval, but the fides were made up of flat furfaces, 
as are reprefented by the letters d , d, d t &c. 
I do not remember to have feen fuch a variety of 
lhapes and figures in any other fait ; and I cannot 
account for the great difference of appearance in the 
fir ft and fecond cryftallifation in any other way, 
than from the liquor in the firft cryftallifation 
having been evaporated to a pellicle, and being 
very highly impregnated with the fait, the cryftals 
began to (hoot at once in every part of it, fo that 
they had not room to extend in breadth, and to 
form themfelves into various fliapes, as in the fe- 
cond procefs, where the liquor was not fo highly 
concentrated, and where each cryftal was formed 
feparate, and at a diftance from another. 
2. The plain wine vinegar, treated in the fame 
way, but in a narrower veffel, yielded a fait which 
had a different appearance from the former ; for 
on pouring off the luperfluous liquor which re- 
mained after the cryftallifation was compleated, it 
l'eemed to be compofed of a number of fmall, thin, 
broad cryftalline, fquare plates, ftanding up from 
about half an inch to an inch above the furface, as 
reprefented by a , a, a , in fig. 13 ; on feparating 
them, each cryftal appeared at the bafis like a 
fmall cryftal of glauber fait, which terminated at 
the top in the thin broad plate already mentioned, 
as reprefented by the letters <£, .b, b , &c. 
On diffolving fome of this fait in water, and let- 
ting it ftand for 18 or 20 days, there formed a 
number 
