Wo (oiiikI lor instance: 



( 419 ) 



'Mif. 



ect. 

 As we snspocted llial tlio i-elrogression of llie activity of the 

 catal^yzer was dno lo I he cvci- inci-easing- layer of C, wliicli fioposits 

 on the catalyzer durini»' the experiment and fillings, Ave nexl used a 

 nickel-pumice wliicli had lieeu reduced al 445° and was in consequence 

 already coated with a layer of carl ion. Altlioiiiih al lirsl llici-e was 

 still a j)erceptil»le diminulioji in Ihe acli\ily, IIk^ (lilïerences in suc- 

 cessive tillings become gradually smaller and linally, the activity 

 was constant as seen from the following table: 



Being satisfied willi this result, we started our iin estigation with 

 the catalyzer of constant activity obtained in this wav. 



/j. }f('(isiii-('m('iits coiiCi'iiiiiKi tJu' order of ilw reaction. 



For Ihe delei-mijiatiou of the ordei- of the reaction Ihe method of 

 VAN 't lloFF was first of all a|)plie(l. It is gixen in this case by 

 the ef[uation: 



_ Xdt dtj 



lo(f (o, : c,) 



28* 



