GLOSSARY 



Anabousm. — See Metabolism. 



Abagonite — ^A mineral (calcium carbonate) identical with 

 calcite in chemical composition, but differing from it 

 in crystalline form (rhombic) and in some of its physical 

 properties. 



Benthos. — A term applied to those organisms which 

 live attached to, or move over, the sea-floor. 



Biosphere. — The sphere of living things found where 

 there is a meeting of the atmosphere, the hydrosphere, 

 and the lithosphere. See Geospheres. 



Bipolar. — ^A term applied to identical or allied species, 

 genera, and families which occur both towards the 

 Arctic and Antarctic regions, but are unknown in the 

 intervening tropical regions. 



Calcite. — ^The rhombohedral form of calcium carbonate 

 (known also as calcspar). 



Catalytic Substances are those capable of bringing about 

 a chemical reaction, even when applied in very small 

 quantities, without themselves undergoing any 

 diminution in quantity. No trace of the catalytic 

 substance appears in the final products of the reaction. 



Centrosphere. — The geosphere occupying all the central 

 portion of the globe, believed to be solid as steel, 

 largely made up of metals and metalloids with im- 

 prisoned gases, and having a mean density exceeding 5. 



Colloidal. — ^A solid may be distributed through a 

 hquid either heterogeneously (in suspension) or homo- 

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