( 421 ) 



The observations at tlie three tenipemtiii-es 250"", 310° and 340", 



flieretbre lead to the eonelusioii lliat we are i-eally dealiiio- liei-e witli 

 a i/iomnno/ecu/ar reaction. 



c. Determination of the readlon-constiDif at 25G^ 310°, 340°. 



Tliese determinations were eondiicted with the same reaction vessel 

 and the same catalyzer. 



256° (boiling point of amvl l)enzoate). 



a vera''.' 0.00027!) 



The following may serve to elncidate this table: 



At 25(>' the catalyzer seemed to still perce|)tibly absorb the CO, 

 whicii caused the diminution of pressure during the first 5 minutes 

 to be excessive. The values for /• arc, therefore, not constant when 

 we start from the pressure corres})onding with the time (), but they 

 gradually diminisii which may be seen from the first two figures in 

 liie last colunui of tlie table. To eliminate the error cansed by absoi-p- 

 lioii, we ha\e, when calculating /', started tVoui the |)ressure coi-re- 

 si)on(ling with the time 5 minutes (column 2) and, therefore, have 

 called this [tressure P„. As the CO concentration had diminished very 

 little in 5 minutes the error thus introduced could be disregarded. 

 The values obtained for /• are found in tlu' last colunm beneath the 

 dotted line. The tollowiug table i-elales to the temperature 310°, 



