Note Book VII. Chap. 1. Note (b) — BOOK VII.

[b] Mr. Willughby saith, there are two Glands for the Secretion of the unctuous Matter in the Oyl-bag. And so they appear to be in Geese. But upon Examination, I find, that in most other Birds, (such at least as I have enquir’d into,) there is only one Gland: In which are divers little Cells, ending in two or three larger Cells, lying under the Nipple of the Oyl-bag. This Nipple is perforated, and being pressed, or drawn by the Bird’s Bill, or Head, emits the liquid Oyl, as it is in some Birds, or thicker unctuous Grease, as it is in others. The whole Oyl-bag is in its structure somewhat conformable to the Breasts of such Animals as afford Milk.