A man who is getting ahead tends to seek a lighter mate, and because “a good man is hard to find,” it would be difficult for a lightskin girl consistently to reject darker people. A darker man who offers security, through social position and other advantages, may well be preferred to a lightskin man of little enterprise.

The 'pretraining' for the two-choice discrimination involved a discrimination between angles differing by 19° (6° versus 25°) in which the smaller angle was marked with a 2 cm Plexiglas square that the bats had previously detected in a simple one-choice discrimination.

Meronyms: external maxillary artery, internal maxillary artery

The intensely bilious color of the liver shows that the discoloration of the contents of the intestines is not due to arrested production of bile, that is to acholia.