[ 5 ” ] 
The cryftals, I obtained in the firft experiment I 
made, were large and flat; and fuch as are to be feen 
at the letters a, a , 6cc. fig. 23; they were of no 
certain fbape or figure; fome were roundfth with a 
number of fides, others appeared fomewhat trian- 
gular, and others of different figures; and in fome 
parts the cryftallifation appeared like a piece of 
rock work. I diflfolved fome of this fait in water, 
and cryflallifed it a fecond time, but the cryftals 
were in general fmaller than in the firft operation ; 
and the cryftallifation appeared as reprefented by 
by by b. In order to fhew the difference between 
this and lea fait, I made Mr. Paul draw the figure 
of fome beautiful cryftals of fea fait, near to thofe 
of this neutral fait of amber. 
This fait is extremely different in its tafte from 
that of fea fait, and certainly likewife in its virtues 
and properties. 
2. In order to afcertain more fully that the fal 
fuccini is an acid fui generis , I faturated fome of it 
with the volatile ammoniac fait, cryftallifed it, and 
obtained a neutral ammoniacal fait very different 
from that of the common fal ammoniacum; it was 
compofed of a number of fmall long narrow fiattifti 
cryftals, whofe fides were made up of four fiat fur- 
faces, fuch as thofe reprefented in fig. 24, and laid 
cryftals of the fait of amber itfelfj that it has a particular tafte, and 
diftblves eaftly in water, which the tartarus vitriolatus does not ; 
and when thrown on the fire, or put on a red hot non, crackles, 
and melts, bite )er remains fixed and neuter* Acids make no 
change on it, nor is aquafottis converted into an aqua regia by 
its mixture; it does i.ot precipitate fiiver from fpirit of nitre, 
though it precipitates lead from vinegar, in form of a white calx, 
which, however, cannot be changed into 2 faturnus corneas. 
