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.
Circ.u.mscribed ma.s.ses 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. These have many a.n.a.logies with the seed of higher plants.
SYMBIOSIS--A mutual adaptation between parasite and host.
TRANSUDATION--The normal interchange of fluid between the blood and the tissue fluids. The material interchanged is the transudate.
TROPISM--The influence of forces which direct the movement of cells.
ULTRA-MICROSCOPE--A form of microscope which by means of oblique illumination renders visible objects so small as to be invisible with the ordinary microscope.
VIRUS--A substance either living or formed by living things which may cause disease.