COMPARISON OF ANALYSIS WITH POLARIZATION, ETC 



477 



indicating the absence of any optically active constituent in the normal 

 juice, other than sucrose. 



SUMMARY OF ANALYSES AND POLARIZATION OF SORGHUM AND MAIZE JUICES. 



MAIZE JUICES IN 1880. 



Number of analyses 17 



Average sucrose by polarization 7.48 per cent. 



Average sucrose by aualysis .. 7.41 percent. 



SORGHUM JUICES IN 1880. 



Number of analyses 40 



Avernge sucrose" by polarization 12 68 per cent. 



Average sucrose by analysis 12 88 per cent. 



In 1879, this comparison was, between sorghum and sugar-cane, as 

 follows : 



Number of 

 analyses. 



.\verage sn- 

 c r o s e by 

 volumetric 

 analvsis. 



-Average su- 

 crose by po- 

 lariscope. 



Sorghum. . . 

 Sugar-cane. 



Per cent. 

 13 26 

 13.30 



Per cent. 

 13 15 

 13 09 



In 1881, the number of these comparisons was very greatlv in- 

 creased, being between 697 analyses of sorghum and 103 analyses of 

 maize. 



