An image of a page from the text that reads "The hinder part of the body of this insect is joyned to the fore-part only by a small thread, and cover'd with a thin skin, on which are hairs of divers colours: it contains the Back, Belly, Parts of Generations, and the Anus. I shall apply my self more particularly to the Description of the Aunus, as being the Part from whence the Spiders draw their Silk; it not being my design to give a Genral Description of this Insect, but only to speak of their Silk, and the Usefulness of it. It is certain, that all Spiders spin their THread from the Aunus; about which there are five Papillae, or small Nipples, which at first sight one would take for so many Spindles, that serve to form the Thread: I have found these Papillae to me Muscular, and furnished with a Sphincter. A little within these I have observ'd two others, from the middle of which issue several Threads, in a pretty large quantity, sometimes more, and sometimes less, which the Spiders make use of...
Nobody talks about how much fun it is to read science from the 1700's. This is from Francois Xavier Bon's "A Discourse on the Usefulness of the Silk of Spiders", published in Philosophical Transactions Volume 27, in 1710. "Parts of Generations" is wonderfully euphemistic.
