The effect of social conditions on disease must become more generally recognized.
GLOSSARY ATROPHY--A condition of imperfect nutrition producing diminution in size and loss of function of parts.
BERTILLON--A French anthropologist who devised a system of measurements of the human body for purposes of identification.
BLOOD-PLASMA--The fluid of the blood.
CELL--The unit of living matter.

Living things may be unicellular or composed of a multitude of cells which are interdependent.

The general mass of material forming the cell is termed cytoplasm.

In this there is a differentiated area termed nucleus which governs the multiplication of cells.

In the nucleus is a material termed chromatin which bears the factors of heredity.
CHEMOTROPISM--The influence of chemical substances in directing the movement of organisms.
EXUDATE--The material which passes from the blood into an injured part and causes the swelling.
FIBRIN--The gelatinous material formed in the blood when it clots.
HAEMOGLOBIN--A substance which gives the red color to the blood; by means of its ready combination with the oxygen of the air in the lungs this necessary element is carried to all parts of the body.
INFLAMMATION--Literally a "burning"; the changes which take place in a part after injury.
LYMPH--The fluid which is contained in the lymphatic vessels--nodes.
Circumscribed masses of cells connected with the lymphatic vessels.
OSMOSIS--The process of diffusion between fluids of different molecular pressures.
SPORE FORMATION--A mode of reproduction in lower forms of life by which resistant bodies, _spores_, are formed.