C 48 5 ] 
foffil alkali. Before adding the alkaline fait in this 
experiment, I tried the temperature of the lemon 
juice with one of Fahrenheit’s thermometers, and 
found that the quickfilver flood in the tube at 54 ; 
upon removing the thermometer, I immediately 
added the alkaline fait; and as the folution was be- 
gun, I again put the thermometer into the liquor, 
and let it remain for above a minute, and the quick- 
filver funk above one degree ; fo that this acid gene- 
rates cold in the time of its uniting with the foffil 
alkali, though the neutral fait, produced from their 
union, does not affedt the thermometer in the time 
of its folution in water. 
The appearance of the fait obtained in this cry- 
flallifation was very different from what it was in 
the former. The whole was made up of an infinite 
number of chryflals, fo fmall that one at firfl could 
fcarce diffinguifh their figure; but on examination 
part feemed to be of the fame ffiape as the larger 
ones, got in the former procefs ; the others were 
very fmall oblong parallelograms, and they were 
every where interfperfed with a number of fmall 
longifh cryflals, which in many places lay acrofs 
each other, and formed a kind of lattice work. 
The general appearance of this cryflallifation is re- 
prefented by b. b. &c. in Tab. XXIII. fig. 1. and that 
of fome of the particular cryflals by c. c. c. 
The tafle of this fait is very mild, and rather 
pleafant, approaching a little to that of a very weak 
fea fait. 
E x PE- 
