Messrs. V. H. Veley and J. J. Manlcy. 



It will be observed that these temperature coefficients increase 

 gradually but by no means uniformly with increase of percentage ; 

 in both cases only very small differences are measured, which accounts 

 for the slight irregularities. There is probably some function con- 

 necting these two factors, but from certain trials made it does not 

 appear to be of a simple character. 



The value for the 60-33 per cent, acid, namely, 0-000406 is not 

 widely different from that 0-000424 given by van der Willigen for his 

 sample of 58*89 per cent, concentration. 



mil. Results. 



The results for /X D reduced to a uniform temperature are set forth in 

 the following table : 



