L 508 ] 
acid liquor. I continued adding the alkaline lye 
till all ebullition ceafed, and the flowers were fully 
faturated and diffolved ; after which I filtered the 
liquor, and evaporated it till a pellicle began to ap- 
pear, and then fet it in a cool place all night, and 
next morning I had a fine pure tranfparent neutral 
fait, fuch as is reprefented by figure 21. It adhered 
to the china balbn in form of a faline cruft, which I 
removed; and on looking thorough it in the light, 
it feemed to be compofed of an infinite number of 
very fmall cryftals; above this lay, in many places, 
a number of cryftals of the figure of fmall oblong 
parallelograms, as thofe at b, b. But from the 
greater part of the furface of the cruft there arofe 
a number of very fine thin delicate plates of irregu- 
lar figures, {landing on one edge; lomewere fquares, 
others parallelograms, and others had more fides, 
the general appearance of which was fuch as is to 
be feen at the letters a, a , a , &c. 
This fait, when firft made, appeared as tranfpa- 
rent and clear as glauber fait, or nitre ; but on be- 
ing expofed to the air, became very foon white and 
mealy. 
In the time of the evaporation of this fait, a 
faline white mealy cruft rofe every where on the 
fides of the china bafon in which the operation was 
performed, and even came over fo far, as to cover its 
whole outfide. What rofe in this manner had a 
fweetifti tafte, and was not fo {harp in the mouth as 
what appeared in a tranfparent {aline form. 
The fuperfluous liquor, which remained after the 
cryftallifation was compleated, being put into a 
tea 
