SECT. 3.
These Glands, as described by Dr. Havers in his new Osteology, and as they discover themselves upon Dissection, are of two Kinds; some are small and thickly interspersed in the Membranes of the Joints, and with very few Exceptions of an equal Bigness, so as to render the Membrane perfectly Glandulous: In some Parts of the Membrane, in the Joints, and in the Furrows of the Bone, these Glands are so united as to form very remarkable and large conglomerate Glands. In some of the large Joints there is but one, as in the Hip Joint; in others, as in the Knee, four or five; they are of a red Colour, which is communicated from the blood Vessels; as to their Substance, soft and papillary, tho’ not tender and friable; they are in their Structure Conglomerate, consisting of divers Membranes, wove one within another, interspersed with small round Vesicles, which are not only contiguous, but adhere closely one to another, as the Membranes also do. By the Pores of these little Vesicles a mucilaginous Liquor is strained and secerned from the general Mass of the arterial Blood, and thence by the excretory Duct, with which all these Glands are furnished, is shed into the Interstices of all the Joints.