80 



In this table we see the position ofthe optimum dépen- 

 dent on tlie time of preliminary warming. 



Testing van 'tHoffs law on tlie values found at the 

 températures under 45° C. the writers find the température- 

 coefficient: 



V20 



= 2.3, 



= 2.0, 



" = 1.8, J/^ = 1.5. 



ri ' rî .=L 



Their conclusion from theso figures is: ,,Tlie value of 

 the quotient appears to be considerably less at high tem- 



