depth usually at a rate greater than 1 C. per meter of depth, 

 cf. Thermal stratification. 



Thermodynamics, Laws of 



(1) Energy and work are transformable from one to an- 

 other kind, e. g., sunlight to chemical energy. (2) Spon- 

 taneous transformation of energy is accompanied by dis- 

 persal of a part into non-available heat such as in respiration. 

 (3) The absolute zero temperature is not attainable. 



Thermogenic 



The production of heat as occurs in an organism during 

 respiration. 



Thermogram 



The continuous record of temperature made by a 

 Thermograph. 



Thermograph 



A self-recording thermometer. 



Thermonasty 



The response of an organism to a general diffuse change 

 in temperature, e.g., the opening of flowers as the tempera- 

 ture rises. 



Thermoperiodism 



The effects of the alternation of temperature such as 

 occurs during day and night alternations upon organisms. 



Thermophilous 



Refers to organism that grows well in high tempera- 

 tures, e.g., bacteria in hot springs. 



Thermotaxis 



The movement of an organism toward heat or cold as a 

 stimulus. 



346 



