179 



A comparison >f the average direct polarizations develops the fact that the hydro- 

 sulphitrs, as in the case of the sugar sample, give the lowest readings, neutral lead 

 acetate next, and then dry and wet lead subacetate, which are about the same. The 

 polarization with Herles' solution is the highest. The low polarization, when using 

 hydrooulphitee, has been already explained. Leaving that one out and the Herles' 

 polari/.ation, th- other three agree fairly well. The calculations for sucrose by the 

 ( l<-r--t f. >rmula give results that agree very closely. The highest is the Herles' result. 

 Wh.-ii i his n-au'-iit is used, the factor is not 142.66, but 143.5, due to the fact of the 

 pn-rm-i- of a nitrate, instead of an acetate salt. Using this factor, the results would 

 hf lower. 



I'nlnrr.ation of molasses vrith different clarifying agents, using an excess ofdarifier. 

 SUBACETATE OF LEAD. 



|.|;v <rn \n-T.\TK OF LEAD. 



NKTTKAL LEAD ACETATE. 



BASIC LEAD NITRATE. 



a Omitted from average. 



When an excess of reagent is used all the polarizations are raised, as shown in the 

 ding tables. In the direct polarization, clarification with an excess of dry sub- 

 acetate gives the least increase in polarization, while the greatest is noted with Herles' 

 solution. Neutral acetate shows a lower reading when used in excess. The agreement 

 in the Clerget calculation here is closer than in the other cases. 



