of Salts and Saline Subfiances . 5 
beyond Defcription beautiful. Vide Plate III. 
No. I. Indeed the Production of the Star- 
like Figures depends on a certain Nicety in 
the Heat continued for a certain Time* 
which one is not always fure to hit precife- 
ly j and therefore, though they appear very 
frequently, they are not quite fo conffant 
in every Trial as its other Configurations ; 
but I doubt not Practice and Obfervatioix 
will render them fo in Time. 
I mult beg leave to call thefe Arrange¬ 
ments of the Particles by the Name of 
Configurations, thereby to diftinguifh them 
from the 'Cryftalizations mentioned ' by 
others, whereto they bear little or no Re- 
femblance. Cryftalizations Teem produced 
by a Tendency or Attraction of the Saline 
Particles towards certain Points, about which 
they combine in regular and determin'd 
Forms, according to their refpeCfcive Kinds. 
Configurations owe their Shapes moft pro¬ 
bably to different Fits of Repulfion and 
Attraction, (thofe two wonderful Princi¬ 
ples which occafion moil of the Changes 
in Nature) taking place at certain Intervals 
and in certain Proportions, and operating 
according to Rules that ace conffant and 
uniform, though little known to us at 
prefent. Or if, to make the SubjeCt un- 
derfiood the better, I may be permitted 
to fetch a Comparifpn from a common 
Suppofition, without examining whether it 
. B 3 
