

recognised that the coefficient value is by no pieans tc iken 

 as constant "but. generally decreases with rising temperatur e. 



curve representing the relation between chemical reaction* 

 velocities and temperature is therefore not an exponential one 

 as seems to have Veer supposed by many writers. If it is not 

 usual for the temperature coefficient to "he constant for si - 

 pie chemical reactions, it is not to he expected that it would 

 be constant for physiological processes where much more complex 

 reactions take plac^. An examination of the experimental data 

 on the relation of a large number of liv3 processes to temper- 

 at-re^ 7 shows that the temperature coef f ici ants for such pro- 

 cesses (with rare exceptions) tend to diminish in value from 

 lower to higher ranges of temperature. Kanitzx^ appears to 

 have been one of the first to regard this feature as essential 

 in the relationship between rates of life processes and tempera- 

 ture. 



Trantz and Volloranni^gave considerable attention to 

 this lowering of temp e rat ure-coe^f iei emts in certain chemical 

 processes. 



17 The data for a larre number of life process rates, with 

 citations of 363 papers has been collected and compiled in a 

 monograph by Kanitz. Kanitz, A., Temperatur and Letensvcr : ' 

 Die Biocbemie in Sinzeldarstellunren. Berlin. 1 : 1-175 - 1915. 



18 Kanitz, A., Uber der Einfluss der Temperat- r " die 

 Kohendroxydassimilation. Zs. Elektroehen;. 11 : 689 - 1915. 



1 9 



Trantz, Max and Volkmann, Karl, Der Temperaturkoef f izi i 



Chemischer Reakticnsgescr .virdiakei ten Uschr. fur physik. 



chem. 64 , 55-58, 1908. 



"0 



