326 GLOSSARY 
Composirz.—A family of plants, including the daisy, 
chrysanthemum, and many others. 
ConyuGation.—The process of fusion of a pair of gametes. 
CoroLita.—The second envelope of a flower, consisting of 
petals—leaf-like organs—usually brightly coloured. 
CorPuscLE.—A very minute particle. 
CytoLocy.—The scientific study of the minute con- 
stituent parts of organisms by the aid of the microscope. 
DENUDATION.—The wearing away of the earth’s surface by 
the action of rain, rivers, etc. 
DIFFERENTIATION.—The separation or discrimination of 
parts which were previously more or less united and uniform. 
EmBryo.—A young plant or animal—usually one which is 
still contained in the seed or the womb. 
EmBryoLocy.—The history of the development of young 
plants or animals from the egg. 
ENVIRONMENT.—Natural surroundings. 
EvoLutTion.—See p. 22. 
Famity.—A group of allied genera, as the family of apes 
(Anthropoida), the buttercup family (Ranunculacea). 
Fauna.—The sum total of animals inhabiting a particular 
region. 
FERTILIZATION.—The union of male and female repro- 
ductive cells or gametes. ; 
FLorets.—The separate flowers of a crowded inflorescence. 
GameETEs.—Sexual cells which unite in conjugation or 
fertilization. 
Genus.—A group of allied species. 
GrEoLocy.—The study of the earth’s crust. 
GrometTric RaTE oF INCREASE.—Progress consisting in 
successive multiplications of the preceding number, instead 
of simply in additions to it. 
GERM-CELLS.—See GAMETES. 
HERBALIST.—One who collects and studies herbs. 
HEREDITY.—The transference of similar characters from 
one generation of organisms to another, a process effected by 
means of the germ-cells or gametes, 
