171 



In this polarization take care to record all temperatures of polarization, dilutions 

 etc., that results mav be compared upon as uniform a basis as possible 



It is als,, uijed that the work on the samples be begun immediately upon their 

 arrival. to avoid changes in composition which might result from fermentation. 



A. HUGH BRYAN, 



Rejeree on Sugar. 

 FRITZ ZERBAN, 



Associate Referee. 



A number of chemists signified their willingness to cooperate, and reports, in whole 

 or in purl, were received from them. 



DETERMINATION OP TOTAL SOLIDS. 



The work outlined was for the comparison of the vacuum method with the regular 

 method ,,f drying i-.r ten hours. But as ten hours is generally longer than the ordi- 

 nary lal.oratory day. a comparison was made of this determination conducted for ten 

 <-utive hours, and uls,, for six hours on one day and four the next. Together 

 with th.- c,,mpari.-..n of methods of determining moisture, the effect of mixing sand 

 with the material to be dried was studied in each case. The refractometer was tried, 

 and the specific gravity was also determined and the moisture calculated. 



Determi nut inns nj moisture in sugar and molasses. 

 SUliAU. 



MOLASSKS. 



o Constant at end of 31 hours. 

 t> Not (Minded in avTiii.v. 



c Constant at end of 10 hours. 

 d By Westphal balance, 23.40. 



It is noted here that the ten-hour drying gives higher results than the vacuum 

 method. This is due, no doubt, to a decomposition of the material at the temperature 

 of b.iiliiu water. The ten consecutive hour results are lower than when the time is 

 dixi.led. The u-e of sand plays an important part in the drying, the determina- 

 lions being higher with sand present. The reason for this is self-evident. The 

 material forms a coating on the sand and between the particles and so presents a 

 i'arger surface to be affected by the heat. When not used, a hard, dry film forms on 



