[ 3 1 3 
ing this feveral times, I obtained a full drachm of 
perfect cryftals, which diminifhed in their fize as the , 
procefs advanced ; and afterwards a fcruple more of 
thin lamellas, which on examining with a magnifying 
glais appeared to be made up of fmall fquare cryftals ; 
there remained a fmall quantity of a fait ley, which 
probably would have yielded a few more fuch lamelke. 
The liquor which remained after the two firft 
parcels of fait were feparated, was next evaporated ; 
but no pellicle appearing, the operation was continued 
till it was quite dry, when it formed one tranfparent 
yellow or amber-coloured fait cake, which weighed, 
one drachm and 34 . grains. This fait on being put 
into a. tea cup, prefently began to run per deliquium, 
and diflolved entirely by ftanding in a cupboard which 
was in a room where there was a fire ; but the fire 
having been let out in the evening, and the night 
proving cold, I found next morning that a cryftallifa- 
tion had taken place, for there was a cryftallifed cake 
at the bottom of the cup, which was covered with an 
amber- coloured ley j. it at firft feemed to be all one 
piece, with a number of fmall points ftanding up on 
its furfaces ; but on reclining the tea cup to a fide, it 
then appeared to be made entirely up of a number of 
oblong cryftals about the length of a barley-corn, but 
not fo thick, and that the points beforementioned 
were the ends of thele cryftals. Not having time to 
examine them particularly in the morning, and to 
know their exadt figure , and number of fides, 1 ftet 
them by, till I fhould come home again about one 
o’clock ; but the day proving warm, they were moil- 
ly diflolved before that time. 
Oil of vitriol, dropt into a tea cup in which there 
was fame of this ley, immediately occafioned a white 
firm i 
