440 EXPERIMENT STATION RECORD. 



jaiii^:, aixl jcllii's l)y tlu' i)i(ivisi()ii:il iiictli(i(l ul' tlu- Association was reported as pre- 

 sentiii<^ certain (lillii-iillit'S <liH' ill i>ait to liie action of the acid used in inversion 

 njxin the maltose and dextrin. 'I'o ohviatc this it was recommended to neutralize 

 the sample immediately after inversion. This method as elaborated was applied to 

 5 samj)les of commercial glucose, the polarization at .S7° C. after inversion averaging 

 95.6 per cent of that at 22° after inversion and 98.8 per cent of the direct reading. 

 To express results in terms of connnercial glucose polarizing at an assumed figure, it 

 was therefore considered necessary in the case of jellies and jams to divide the read- 

 ing at 87° by 93 per cent of the assumed factor. It was announced that thv? study of 

 this i>roblem was being continued with the hope of working out a reliable formula 

 for the calculation of invert sugar in the presence of commercial glucose. 



K. (iudeman compared the metbods given by himself and by Dr. Leach in the pro- 

 ceedings of last year's meeting, claiming greater accuracy for his method. Dr. (Jude- 

 man believed that the Association should adopt a constant for the polarization of 

 glucose or accejit a constant for the percentage of water and use these factors irre- 

 spective of the article vmder examination. He also contended that but one grade of 

 glucose is manufactured in the United States at the present time, which statement 

 met with considerable objection. The proposition to express results in terms of 

 glucose polarizing at a definite figure seemed to meet with general approval. L. S. 

 Mxinson considered the factor 175 too high. 



SUGAE. 



It was stated by the referee that ver}" little work had been done on 

 this subject during- the year. The associate referee, L. S. Munson, 

 reported progress on work with reducing sugars, stating that he had 

 prepared a solution which had about one-third the action on cane sugar 

 as the regular Soxhlet solution. The associate referee on reducing 

 sugars for next year was instructed to communicate with a commit- 

 tee of the International Conuiiission for Uniform Methods of Sugar 

 Analysis with a view to cooperating in obtaining a uniform method 

 for determining reducing sugars. 



The appointment of an associate referee on molasses was authorized 

 and a continuation of the work on beet-sugar methods was also 

 requested. The method of determining the copper reduced by direct 

 weighing of the cuprous oxid and the German official method for the 

 determination of sucrose and raffinose were adopted as official methods 

 in essentially the same form as recommended last year. The methods 

 recommended last year as provisional methods were this year adopted 

 as such. The principal recommendations made by the International 

 Commission were briefly explained b}' H. W. Wiley. One paper 

 relating to the analysis of molasses was presented. 



Report of referee, L. M. Tolman. — This consisted of brief statements concerning 

 the work on sugar during the year and of the seA'^eral recommendations for next 

 year's work noted above. 



Remarks on molasses analysis, H. E. Sawyer. — The methods in use for testing 

 molasses were considered unsatisfactory when applied to low-grade goods. In clari- 

 fying such molasses it was found more satisfactory to use a solution of basic lead 

 acetate of greater dilution (26 gm. in 500 cc. ) than that required in the official 

 method. Tests were made of this method during a period of 2 years; and while it 



