326 



TABLE V. 

 Me so-acid without coal. 



TABLE VL 

 Meso-acid with coaL 



Time 



in 

 min. 



cc. thio 

 n 

 40 



cone. 



"/800 



k 



mono- 



mol. 





 289 

 576 

 806 



0.06 

 1.11 

 2.12 

 2.83 



19.94 

 18.89 

 17.88 

 17.17 



0.000187 

 189 

 186 



k mean 0.000187 



k mean 0.000724 



hose with the meso-acid. The initial concentration of the acid was 



/40 n., that of KJ 2n.; work is done at 25° centigrade, in CO,- 



atmosphere, in the dark room ; 1 gramm of coal was added per 



100 ccm.; in the experiments with^coaPlO ccn». of the reacting 



mixture were poured into 20 ccm. of thio-solution of 0.02525 n.; 



he titration was done with a J-solution of V' „ n. 



These results, shewing a great accelleration of the reactions, 

 fully support our theory. 



We have still other expirience, which is in, accordance with this 

 theory. Dr. C. F. van Duin wil give presently a detailed paper in 

 Recueil des Travaux chimiques des Pays Bas. 



Utrecht, VAN 't HoFF-laboratory, 



*S/. Andreios, United College of St. Leonards 



and St. Salvador 1922. 



