A hundred times had Martin obediently looked at the specimens in the brown, crackly-varnished bookcase: the beetles and chunks of mica; the embryo of a two-headed calf, the gallstones removed from a respectable lady whom the Doc enthusiastically named to all visitors.
…and he had assured each other that, for a student affair, dinner jacket and black waistcoat would be the thing, as stated in the Benson, Hanley and Koch Chart of Correct Gents’ Wearing Apparel, but he grew miserable at the sight of voluptuous white waistcoats, and when that embryo famous surgeon, Angus Duer, came by, disdainful as a greyhound and pushing on white gloves (which are the whitest, the most superciliously white objects on earth), then Martin felt himself a hobbledehoy.
There are no more uses of "embryo" in the book.
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The doctor implanted multiple embryos to increase the chances of a successful pregnancy.