( 63 ) 



SOj per litre, wliile tliat from a well, 44 M. deep, near tlie place 

 Avhere the feji had heen taken, eontaincd only 17 mp;. SO^ per litre. 

 Already ininiediately below the clay, at a depth of ten metres below 

 the meadow, the amount of SO., has become so small. In the iron- 

 containing layer of clay, pyrites is namely formed by tiie well-known 

 minerogenetic process, with previous j-ediiction of the SO, com[H)nn(ls 

 in the fen, which i-eduction takes jdace here with the help of sMl|)hnr- 

 bacteria by which the freshly (hMiuded ihn is coloured yellowish. 



Pyrites can indeed be shown to occur in the clay. And so this 

 difference in the amount of SO. between the upper water and the 

 deep groundwater is a proof for the origin of the latter from above 

 instead of against it, as has been supposed. 



Chemistry. — Prof. C. A. Lobry dk Bruyn also in the name of 

 Dr. S. Tymstka Bz. read a paper: "IVie nieckanlsui of the 

 sa Ucylacid synthese. ' ' 



(Tills paper will not be published in these Proceedings). 



Chemistry. — Prof. C. A. Lobky dk Bki yn presents a paper of 

 Dr. J. J. Blanksma : "(hi the Intraiuoleciihir (wydatian of ei 

 SH-yi'Oup bound to benzol hy an oethosteindlmj NO^-yroup.'''' 



(This paper will not be i)ublislied in these Proceedings). 



Chemistry. — Prof. (J. A. Lobry de Bruyn presents a paper of 

 J. M. M. Dormaar: ''The Incerslon of carron an,d eucarvon 

 in carvacrol and its velocity .'' 



(This paper will not be published in these Proceedings). 



(June 24, 1904). 



