. . f ^ ^ 
between the Gravity of the Particles fwlmming in the 
Menftrurm, and the Tenacity of the Fluids, isdeftroy- 
ed, on which account they mud fink. By the fecond, 
. the Particles will be carried down to the bottom by the 
force of a heavier Fluid. He /hows likewife, how Pre- 
cipitation may be caufed by .infafion of Saline Men- 
flruums, whole Salts attrading the Particles that fwim 
in the Fluid, and cohering wjth them, they will form 
fuch Bodies, whofe Gravity will over-power the Tena* 
city of the Fluid, and defeend. From which Principle 
he deduces the realbn of all Chymical Coagulations. 
In Crydallization of Salts, he obferves, that a great 
pai*t of the Fluid, in which they are diffolved, is evapo' 
rated: On 'which account,- their Particles coming near- 
er to one. another, , their attraclive force is encreafed, 
and they will come and unite together; and becaufe 
the Figures of the minute Particles of each Salt are al- 
ways uniformly the fame,- and their attractions^ being 
ftronger on one fide than another, they will always 
cohere to one another in -fuch fides as have the great* 
eft attract ve force. On which account they mult'ne- 
celTarily form Bodies of certain determin’d Figures, 
which in the fame fort of Particles are always the 
fame. 
Z Z 2 
n . j4h 
