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. 



AMOEBOID. Pertaining to or resembling Amoeba. 



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

 factors from different individuals. 



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. 



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

 cylinder. 



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



BLASTOPORE. The opening or mouth of a gastrula. 



BLASTULA. An early stage in development of the egg prior to the gastrula 

 or two-layer stage. 



BRANCHIOSTEGITE. Lateral gill-protecting portion of the crustacean exo- 

 skeleton. 



BUCCAL CAVITY. Mouth cavity. 



CARBOHYDRATE. Any organic body containing carbon, with hydrogen 

 and oxygen in the proportions represented by water (H2O). 



CELL. A unit mass of protoplasm consisting of nucleus (or nuclei) and 

 cell body or cytoplasm. 



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