Such enlarged glands may be differentiated from tumors by passing the hand into the cow's throat after the jaws are separated by a suitable speculum or gag.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Denique Inspicere tamquam in speculum in vitas omnium Iubeo atque ex aliis sumere exemplum sibi.
"The Roman Poets of the Republic"
W. Y. Sellar
Even in the days of Bagford, at the very outset of the eighteenth century, interest had been aroused in the block-printed editions of the speculum Humanae Saluationis, so that Bagford himself travelled from Amsterdam to Haarlem on purpose to see a copy of one of the Dutch editions, and set an English wood-cutter to work, with very poor success, to manufacture a bogus specimen of it, wherewith "to oblige the curious."
"Fine Books"
Alfred W. Pollard