C ssi ) 
ways affe&s the fenfible parts about them$ and if it be 
Acid makes a Coagulation, or infpiffates the Mucilage^ 
and then the Gout (ticks fome confiderable time. The 
generation of the Tophaceous Matter in the nodofeGout 
is accounted for, from the Experiments made with Acid- 
Auftere Liquors mixed with the Mucilage 5 fo that where 
the Gout is nodofe, the Mucilage is firft coagulated by 
fome Acid-Auftere Matter, and the Coagnlum made by 
fuch a Matter is not fo eafily dififblved, as when it is made 
by an Acid only. This Coagnlum therefore being im- 
prifoned, and the more grofs and earthy parts being un- 
capable of an evaporation or being otherwife fpent, are 
concentrated and indurated by the evaporation or 
flowing off of the moid Particles, and fo produce a 
hard, and chalkey Subftance. 
The laft Difcourfe is of the Cartilages, which approach 
near to the Nature of Bones, but differ from them in 
their Formation, and in their flexibility: This flexibility 
is from the Figure and order of their parts, which are 
fuch that the Particles (as they muft Aide one way or 
other in the inflexion of a Body) may move without 
interrupting the continuity of the whole, even when they 
recede from one another, unlefs they are forced too far. 
That recoyling, whkh is found in thefe and other flexible 
Bodies that have a rigidity, arifes from a preflure made 
by the fpring of the Air, either implanted and fiiutup 
in the interftice&of the Particles, as when the Particles 
are driven nearer to one another, and thofe Interfaces 
are contra&ed : or by the Elaftick power of the external 
Air, when the Particles of the Body recede from one 
another, and drive up the fpring of that Air. 
The Cartilages have a Membrane every way like to the 
Perrojiium, and is a continuation of it, where they are 
joyned to any Bones* Blood VefTels they Ukewifehave 
in great numbers. 
The 
