The pig is farrowed with a fairly definite set of specifications for development all wrapped up in their mystery in a two to three pound bundle of throbbing, active "stuff." And yet before the pig sought the outer life apart from the womb of his dam, these specifications were enclosed in the minutest bit of protoplasm, the impregnate ovum resulting from the union of two germ cells, one from the male and the other from the female.
Proceedings of the Iowa Academy of Science
©1915 Iowa Academy of Science, Inc.
Evvard, John M.
"Is the Appetite of Swine a Reliable Indication of Physiological Needs?,"
Proceedings of the Iowa Academy of Science, 22(1), 375-403.
Available at: https://scholarworks.uni.edu/pias/vol22/iss1/57