GLOSSARY 



ACROGEMALY. A disease charac- 

 terized by hypertrophy of the 

 terminal parts of the body, as 

 of the face and extremities ;. an 

 outgrowth involving bony and 

 soft parts. 



ADRENALS. A pair of small glands 

 situated in front of the kidneys. 

 They are glands of internal se- 

 cretion, their secretion exercising 

 in particular a regulating effect 

 on the nerves of the heart and 

 blood vessels. 



ADRENIN. The "active principle" 

 in the secretion of the adrenal 

 glands. 



ALCYONARIA, include many corals 

 and other coelenterate animals 

 with eight mesenteries and eight 

 tentacles. 



ALVEOLAR. In anatomy, a numer- 

 ously-pocketed, or sacculated, 

 structure, typified by the ter- 

 minal cavities of the lungs, but 

 occurring in various tissues; be- 

 lieved to constitute also one kind 

 of protoplasmic structure. 



AMOJBA. A unicellular animal, a 

 genus of rhizopodous Protozoa. 



AMPHIBIAN. An animal living 

 both in water and on land. 

 Properly a class of vertebrates 

 whose young are typically aquat- 

 ic and respire by gills; examples, 

 frogs, toads and salamanders. 



.\MPHIOXUS, literally pointed, or 

 sharp at both ends. The cur- 

 rent name for one of the very 

 simplest and lowest vertebrate 

 animals occurring in the sand 

 and mud of the seashore in 

 many parts of the world. 



ANABOLIC, the chemical up-build- 



ing of the living body; construc- 

 tive metabolism. 



ANTIBODIES. "The products of a 

 reaction of the body towards a 

 natural or artificial introduction 

 into it of certain foreign sub- 

 stances, bacteria and their poi- 

 sons, vegetable poisons of other 

 kinds, and various albuminoids." 

 The name antibodies has refer- 

 ence to the antagonism thess 

 products have for the introduced 

 substances. 



ANTIGENS. Substances the reac- 

 tion of which with the living 

 body produce antibodies. 



ASCIDIANS. Marine animals hav- 

 ing a gelatinous or leathery en- 

 velope containing cellulose. In 

 the larval stage a notochord or 

 forerunner of the vertebral col- 

 rmn is present. Some free liv- 

 ing species retain the notochord 

 all through their lives. 



AXON. The long, slender, sparce- 

 ly-branched, fibrillar process of 

 a ganglion cell; contrasted with 

 the shorter, more branched, more 

 irregular dendron. 



AXOSTYLE. A slender, flexible rod 

 of organic substance forming a 

 supporting axis for the body in 

 some Protozoa. 



BIOGEN. Literally life producer. 

 Imaginary ultimate units of life. 

 Such special significance as the 

 "biogen theory" has over other 

 theories which make imaginary 

 vital or physiological units a 

 goal of the ultimate explanation 

 of life, is found in the fact that 

 the biogen theory aims to be 

 more definitely chemical than 



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