TYLOR, Mr., on the prohibition of consanguineous marriages.
UDDERS, development of the.
Ulex, double-flowered.
Ulmus campestris and effusa, hybrids of.
UNIFORMITY of character, maintained by crossing.
UNITS of the body, functional independence of the.
UNITY or plurality of origin of organisms.
UREA, secretion of.
USE and disuse of parts, effects of. -in rabbits. -in ducks.
UTILITY, considerations of, leading to uniformity.