GLOSSARY 



ACQUIRED CHARACTER. A character which originates during the life of 



an individual and due to environmental causes. 



ADOLESCENCE. Youth, or the period of life between sexual maturity and 

 full development. Usually employed in connection with young of 

 the human race. 

 - -ALLELOMORPH. One of two factors standing for the same character in 



inheritance. 



ALTERNATION OF GENERATIONS. A phenomenon in the reproduction of 



animals or plants, whereby an organism resulting from fertilization or 



parthenogenesis gives rise to other organisms by some asexual 



method of reproduction (division, budding, or sporulation). 



AMBOCEPTOR. An intermediate chemical body acting as the linking factor 



between two other chemical bodies. 



AMINO-ACID. An acid containing the amino-group NH 2 . 

 AMOEBOID. Pertaining -to or resembling Amoeba. 

 AMPHIMIXIS. The union in the fertilized egg of germ plasm and hereditary 



factors from different individuals. 

 AMYLASE. A ferment capable of dissolving starch. 

 AMYLOLYTIC. Starch dissolving. 

 ^/ANABOLISM. Processes of constructive or ascending metabolism, whereby 



energy is absorbed and stored up. 



ANTHEROZOID. A minute male germ cell of the fern and other cryptogams. 

 ANTIBODY. A chemical substance capable of counteracting or neutralizing 



a toxic substance. 



ANTIGEN. Any substance capable of entering into combination with proto- 

 plasmic molecules and of stimulating the formation of antibodies. 

 APICAL CELL. The single cell which in higher cryptogams constitutes the 



growing point. 



ARCHEGONIUM. Female sexual organ of the fern and higher cryptogams. 

 ^ ARCHENTERON. Primitive or first gut of developing animal embryos. 

 ARCHESPORIUM. A spore-producing cell. 

 AUTOTROPHIC. Capable of independent or self-nourishment. 

 AXON. The main nerve process from a nerve cell; also called the axis- 

 cylinder. 

 BASAL BODY. Part of the kinetic complex of a flagellated protozoan which 



gives rise to the flagellum. 



BLASTOMERE. Any cell in the early cleavage stages of the developing egg. 

 - BLASTOPHORE. Sperm mother-cell in earthworm spermatogenesis. 

 BLASTOPORE. The opening or mouth of a gastrula. 



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