SECT. 3.
Nuck hath sometime ago demonstrated, that these conglomerate Glands are a Bundle of small Vessels; that their excretory Ducts are Continuations of the arterial Ramifications, and that these Glands owe their Origin to the smallest Branches of the Arteries: These Arteries, which enter the glandular Substance of the Breasts, are imperceptible to the naked Eye, and discoverable only by injecting a very fine Tincture (which Nuck tells us is known to very few Anatomists) into the Artery; this may be so far propelled, as to render the milky Ducts conspicuous. For the better Discovery of this Matter, Nuck instituted another Experiment equally curious and useful; having met a Nipple full of excretory Ducts, he pressed it, and the Breast adjoining, so as to empty all its Contents, and having pitched upon one of the widest Ducts, he injected Mercury so artificially, that he immediately observed the milky Ducts spread like Branchings of Trees; some Part of the Mercury was carried so far as to enter the Arteries, whence the milky Vessels were continued.