( 735 ) 



(A) this must be noticed); but in space (i. e. the S, ± OW) 

 those systems of coordinates OXr Y,. Zr and OXi Yi Zi have at 

 eacli moment very definite positions diflfering from one another. 



Chemistry. — Prof. C. A. Lobry de Bruyn read also in the name 

 of Mr. L. K. Wolff a paper entitled: ''Can the presence of 

 the molecules in solutions be proved by application of the 

 optical method of Tyndall.^" 



(This paper will not be published in these Proceedings). 



Chemistry. — Prof. C. A. Lobky de Bruyn presents also iii the 

 name of Prof. A. F. Holleman a paper by Dr. J. J. Blanksma, 

 entitled: 'Uhi the substitution of the core of Benzene.'' 



(Tliis paper will not be published in the Proceedings). 



(April 19, 1904). 



