Impulses which, reflexly, call forth motion.

Excito-Secretory

Impulses calling forth the activity of gland cells, commonly applied to afferent influences which act reflexly.

Fibrinogen

A form of globulin obtained from serous fluids, which, on being added to a liquid containing serum-globulin, gives rise to the formation of fibrin.

Fibrinoplastin

A term sometimes applied to paraglobulin or serum-globulin.

Filiform

A name given to a class of papillae of the tongue, the points of which taper off to a thread.

Foetus

The fully-formed embryo while in the uterus or egg.

Fovea Centralis

The depression in the centre of the macula lutea.

Fungiform

A class of papillae of the tongue, shaped like a toadstool.

Galvanometer

An instrument for measuring the direction and strength of electric currents by means of the deflection of a magnetic needle.

Ganglion

A swelling. Chiefly used to denote swellings on nerves containing nerve corpuscles. Hence, any group or mass of nerve cells.

Gastrula

A stage in the development of animals in which they consist of a small sac composed of two layers of cells.

Gemmation

Budding - a process of reproduction in which a bud forms on the paient organism, and finally separates as a distinct being.

Globulin

A form of albumin insoluble in pure water, but soluble in weak solutions of common salt.

Glomerulus

A bundle of capillary loops which form part of the Malpighi^n body of the kidney.

Glycocholic Acid

An acid existing in large quantities combined with soda in the bile of man.

Glycogen

Animal starch; a substance belonging to the carbohydrates, which is made in the liver. It may be readily converted into grape sugar - from which fact it derives its name.

Gustatory

Pertaining to the sense of taste.

Haematin

A dark-red amorphous body containing iron; obtained from the decomposition of the coloring matter of the blood (haemoglobin).

Haematoin, Or Haematoporphyrin

Iron-free haematin prepared with strong acetic acid.

Haematoidin

A substance found in old blood clots, as crystals, which cannot be artificially prepared.

Haemin

Hydrochlorate of haematin; easily obtained, as small, dark crystals, by boiling blood to which some common salt and glacial acetic acid have been added.

Haemochromogen

Unoxidized haematin, the first outcome of the decomposition of haemoglobin.

Haemoglobin

Reduced oxyhemoglobin.

Holoblastic

The form of ova the entire yolk of which enters into the process of segmentation.

Homceothermic

Even temperatured - a term applied to those animals that keep up a regular temperature, independent of their surroundings - warmblooded animals.

Hyaloid

Glass-like; a name given to the delicate membrane enclosing the vitreous humor.

Hydrocarbons

Compounds of carbons and hydrogen. Fats, though containing oxygen in addition, have been called hydrocarbons.

Hypermetropia

The condition in which the focus of parallel rays of light lies beyond the retina; also called long sight.

Hypertrophy

Increased growth from excessive nutrition.

Hypoblast

The undermost of the layers of the blastoderm, from which the pulmonary and alimentary tracts and their glands are formed.

Infusoria

A name given to a large class of simple organisms which are found in dirty water.

Inhibition

A checking or preventive action exercised by some nervous mechanisms over nerve corpuscles and other active tissues.

Inosit

A sugar peculiar to muscle.

Irradiation

The phenomenon that bright objects appear larger than they really are. It is due to the extension of the effect to those parts of the retina immediately adjacent to where the light rays impinge.

Karyokinesis

A series of changes occurring in the arrangement of the nuclear network prior to the division of the protoplasm of cells.

Katabolic

A lowering influence exerted by certain nerves, decreasing metabolism. Inhibitory action.

Keratine

The characteristic chemical constituent of the horny layer of the skin and epidermal appendages.

Kymograph

An instrument used for recording graphically the undulations of blood pressure, measured directly from a blood vessel by means of a manometer.

Lachrymal

Pertaining to the secretion of tears.

Lacunae

Small spaces in the substance of bone tissue, occupied during life by the bone cells. They appear black in sections of dry bone, owing to their containing air, which replaces the shriveled cells.

Latency, Or Latent Period

The time that elapses between the moment of stimulation and the response given by an active tissue.

Leucin

This is a common product of the decomposition of proteids. It is foimed in the later stages of pancreatic digestion.

Leucocytes

A term applied to the white blood corpuscles and lymph cells.

Lumen

The open space seen on section of a tube, vessel, or glandular saccule; the cavity surrounded by the gland cells, in which the secretion collects.

Luscitas

Fixation of the eyeball in the outer canthus, owing to the unopposed action of the external rectus muscle.

Lymph

The liquid collected by the absorbent vessels from the tissues; the return flow of the irrigation stream escaping from the blood vessels to nourish the tissues.

Macula Lutea

That part of the retina near the axis of the eyeball, in which vision is most acute.

Manometer

An instrument for measuring pressure; made of a U -shaped tube containing liquid, commonly mercury.

Medullary Sheath

A soft, clear sheath around the axis cylinder of medul-lated nerves, which, owing to its refracting power, gives them a white appearance.