C 5 So ) 
In the fourth Difcourfe we have an account of a par- 
ticular fort of Glands, which he calls the mucilaginous 
Glands feated in the Joynts. Thefe are of two forts ^ 
fomeare fmall, and in a manner miliary Glands, being 
Glandules placed all upon the fame Surface of the Mem- 
brane, which lies over the Articulations, The other 
fort are conglomerate, or many Glandules collected and 
planted one upon another, fo as to make a bulk, and con- 
siderable Glands. In fome of the Joynts there are fe- 
deral of them, in fome there is a fingle Glaod. For the 
Structure of thefe large Glands, they confift of fmall Ve- 
ficles, which are not gathered into feveral Lobules or 
Bags of Glandules, but are difpofedupon feveral Mem- 
branes lying one over another, of which Membranes 
there are feveral in every one of thefe Glands, which 
appear evidently in fome that are Hydropical. 
They have their Blood Veflels, as other Glands, but 
their Veins have a particular flexure in their cotuit* for 
retarding the return of the Blood frorr, t Glands, that 
the mucilaginous Liquor, which is not Lparated with 
the greateft expedition, may have time to penetrate the 
decretory Pores of the Glandules. 
The large mucilaginous Glands are varioufly feated, 
fome in a Sinus formed in the Joynt, others rtand near 
or over againft the Interface between the articulated 
Bones : but in general they are fo placed as to be fqueezed 
gently, and lightly preft in the inflexion or extenfion of 
the Joynt, fo as to feparate a quantity of Mucilage pro- 
portionate to the motion of the part, and the.prefent 
occafion, and yet without any injury. 
We have alfo fome defcription of the common Mem- 
brane of the Mufcles, how it is every where fet thick 
with the fmall mucilaginous Glands $ and about fome 
Joynts which are often moved, and where the Tendons 
run backward and forward more confiderably, it has 
fome larger or conglomerate Glands. 
The 
