21 



.tuition* nit n .vim/tie <>f linr, nirunni method nifhoitt mi.n'ny n ith sand, 

 shoving gradual loss of moist it/, 



Grams. Gm. Gms. Cm. 



Grams. Grams. Grams. 

 45,6373 40.7115 40.0977 

 45.4085 40.4024 40.3888 

 46.1368 40.5963 40.5435 



Gm. Grams. Gm. 

 0.0138 40.687: 



Gms. 



4.8528 70. Jin 

 :.. i '-':;:, 70.439 

 ro.2so 



0m. 



., 'Uls 

 7. 1317 

 8.0140 



0138 40.38501 



..'I.') .0240 



4n.:.r.'l .009440.5070 O.OOol 



<>f mnixtnn- <i> firm inntioiu made by '/a 

 the ojfirinl method. 



method uith those made by 



a The corn chop was placed In vacuum a fourth time twfore it ceased to lose In weight. 



' The milk and butter were mixed with amnd and were dry by the vacuum method at the end of twelve 



THE UNIFICATION OF SACCHARIMETRIC OBSERVATIONS. 

 By C. A. BROWNE. 



In an article u{>on the Control of SacchariuM'trm by Otto Srliimrork." it is <lm\vn 

 that the differences in rotation for sugar solutions ili.sappear for clitf-rvn 

 and dit'tVrrnt sources of whitr li-^ht only \vh-n th- li^'ht is lilt.-n-d thn.u-h ;i I .." . m 

 of 6 percent potassium bichromate solution in water ( >n th< l..i-i- <>i ih.-.- 

 Schdnrock recommends that the use of this liirht tilt. -r be adopted in 

 tin- MX) point of tin- \Vntzke scale. This recommendation, which has l.ren 

 followed by the Iinpt-rial Il-ii -hs Anstalt of German \ anl th.- I S. Cureau of 

 Standard.-, s.-.-m-, hi\\i-\.-r. i<be more or lew disregarded by many < h-nii~is who work 

 with -ac -harim- 



Tin- nifthods of the Association of utfirial Agricultural ( 'ht-mistM say nothing as to 

 tin- use of potassium liirhromate solution in sacchari meters, it heirrj deemed perhap- 

 a necessity too well known to require mention. \\ e know, however, of chemiHts 

 pun hasing sacchari meters and using them for years blL-vfully iirnorant of the presence 

 of the empty cell in the end of their instruments or of the purpose for which the cell 

 was intended to be used. Their mistake, which is due usually to inability to read 

 the German directions which accompany the instrument, in perhaps pardonable. 

 Leas pardonable is the attitude of tho><- < hemi-ts who, knowing of the cell and the 

 purposes of its u<e, yet wilfully neylect it. One very common and mont fallacious 

 argument advanced against using the cell is that standardi/ed quartz plates polarize 

 correctly without it and that its use is therefore wholly unnecessary. Another reason 

 uiven is that the bichromate renders the polari/ation of dark colored solutions so 

 difficult that it is more convenient to eliminate it altogether. 



Zts. Ver. d. Zuckerind., 41: 521-58. 



