GLOSSARY ie: 
Chromomeres. See Chromatin granules. 
Chromosomes. The dots, rods, rings, or other bodies that exist in definite 
numbers in the nucleus and that derive their name from the readiness with 
which they assume color under the various staining reagents employed by 
biologists to bring out structural differences under the microscope. 
Chromatin granules. The minute granular masses of which the chromosomes 
appear to be composed; synonymous with chromomeres. 
Cross breeding. Synonymous with crossing. 
Crossing. The fertilizing of one species by the male of another species, 
race, or variety. Synonymous with cross breeding. 
Cytoplasm. The cell contents that surround the nucleus. 
Degenerate. The individual which has inherited in strong degree the worst 
characters of his race with few or none of the best, though he may have one 
or more exceptional faculties. ; 
Determinant. Such an association of ids (Weismann) as may be able to fix 
the character of a part in its development. 
Development. Progressive change; specifically the appearance of racial 
characters in the individual as growth proceeds. 
Differentiation. The appearance of distinctly differing organs and parts 
during and after embryonic development. 
Dominant characters. See Characters, dominant. 
Dwarf. The individual in which the process of growth has been arrested 
abnormally early. See Giant. 
Embryo. The fertilized ovum after growth and differentiation begin. 
Embryonic development. Growth and differentiation of the embryo. 
Environment. The conditions of life as a whole, both good and bad, that sur- 
round the individual or the species, by which it may be either benefited or 
oppressed, but with which it must live and compete. 
Eugenics. The doctrine that human beings should be well born by attention 
in marriage to the well-known facts of heredity. 
Evolution. The theory that species originate by development from other 
and preéxisting species by means of more or less gradual modifications either 
through crossing or the influence of the environment, or both; over against the 
older theory that each species was specially and separately created, and that 
it remains unchanged and unchangeable. 
Fetus. The more or less perfectly developed embryo before birth. 
Gamete. The fertilized ovum or ovule. 
Genetics. The science of breeding from the standpoint of the transmission 
of hereditary characters without regard to the influence of environment. 
Germ plasm. Reproductive or sex cells in general, without reference to 
sex. 
Germinal matter. Synonymous with germ plasm. 
Giant. The individual in which cell division and growth have proceeded 
beyond the normal. See Dwarf. 
