583 



From the results united in table I'' it follows that with N°. 5 

 and 9, where 5 cm' of 1,06 normal NaOH has been added after 

 three hours the polarisation has been lowered from +11,4 to 

 + 5,3 (N". 5 and 9, I^). 



The presence of 1,06 milligrammolecule of meta- and para- 

 hjdroxj benzoic acid has caused that the polarisation has been 

 lowered only to + 7,5 and -\- 7,7 (N". 7 and 8, P) about equal 



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