( 3 * ) 
It is call’d Tnfufion, when the Menflruttm is either Wa- 
ter, Ale, or Wine; but a Tincture, when Brandy is 
employ’d;,) and the bed way to obtain the ufeiul Par- 
ticles of volatile, tenuious, or fubtile Subftances, is by 
Diflillation. Thefe may indeed be proper Ingredients 
for an Infuiion or Tin&ure. But there are a great 
many fix’d Subdances as improper for Didillation, as 
the Volatile are improper for Extracts. Thus l have 
thought fit to tliew the means of finding out the Vir- 
tues of Plants without difiolving their Texture ; But 
if any has a mind rather to do it by the Chymical 
Analyfis, this is not to difiuade them. 
X. An Account of a 'Boo 4, Entituled, Geometria 
Organica, five Defcriptio Linearum Curva- 
rum Univerfalis. AuBore Colino Mac Laurin 5 
Mathefeos in Collegia NoVo Abredonenli *Pro- 
H E Defign of this Treatife, is to examine the 
various Methods propofed by Mathematicians, 
for defcribing Geometric Curves ; and at the fame 
time to demonflrate a new one, infinitely more Gene- 
ral than any hitherto publiihed ; built on tbofe Theo- 
rems propofed by our Illuftrious Prefident, ac the end 
of his Enumeration of the Lines of the Third Order® 
The great Improvements that have been made by mod 
of the other Modern Geometricians, have related chiefly 
to the Lines of the Infinite Order ; they have been fo 
fond of applying their new Methods to Mechanic and 
Exponential Curves, (which undoubtedly ought to 
fejfore, R. S. S. 
give 
