8 BULLETIN 466, U. S. DEPARTMENT OF AGRICULTURE. 
SUCROSE. 
Sucrose was determined from the direct and invert polarization, 
by the Clerget formula,’ using the factor 142.66 and hydrochloric 
acid as the hydrolyst. .The results on a number of samples where 
invertase was the hydrolyst were identical with those obtained with 
the acid inversion. 
INVERT SUGAR. 
Munson and Walker’s method and tables? were used. The pro- 
cedure, which is the same as applied to the sap sirups, is given on 
page 16 of Bureau of Chemistry Bulletin 134. 
ASH. 
Five grams of the sample were ashed in a platinum dish in an elec- 
tric oven in the usual way.* After ashing, a few drops of ammonium 
carbonate solution were added, the whole evaporated, ignited, and 
reweighed. The same procedure was followed in the case of insoluble 
ash. Alkalinity determinations of the - and insoluble ash were 
also made by the usual method. 
In valuing maple products, the percentage of total ash is important 
as well as difficult to ascertain, so that the utmost care is necessary 
in carrying out this determination. Table VI shows determinations 
of ash on the same sample: (1) By burning over a free flame at a 
low heat and again at a red heat; (2) by burning in a muffle at a low 
and again at a high heat; (3) by burning in an electric oven at ordinary 
temperature. Following the results in the table are the same determi- 
nations after treatment with ammonium carbonate and reignition. 
TABLE VI.—Effect of method of burning on ash content. 
[Not calculated to dry basis.] 
Ash after 
Ex- : : adding 
peri- ample ammonium 
ment ne Burned. Temperature. Ash.4 = arb onate 
No. and heat- 
ing.4 
Per cent. Per ceni. 
Free fame pe scbeceb lds fees Bee te Low: eet ee 0. 3 0. a 
oe ce Soe ees tian co Son Coe eee igi s D¥ed cise ee Z : 
1 8337 | Wlecteig sta eee. 2.0) eee | Bower ae .53 .54 
Gas muffle: 46223 2. 2 eee WOW 2.207 eee . 4 . 54 
0. 3S: - See En oh 5: 49 . 54 
Free flame. 8213 226. ite tee pee a bows. 4224. 51 . 50 
2 9235 es iO. ee eee ea a. See ich 2S 2 os 44 51 
Electric mufles3:.. 2.2 See | Wows} 222683 52 -oL 
3 87 eae eee eases 31 34 
4 512 | Free ete Ds nissan ojo oo. SEE | ny -. -ptaee 38 in 
Se | esate ast eee  -hc eB epees Hoes nse Ste ghs6 ‘ 
ee, Mamie: fe st ct: eee Lows -psete® - 48 48 
5 8554 Bs (Ye 20 TS I Os ee | Mich 6. sy). -40 42 
'| Electric mufnef).2.).).'2))) ee Bead | dows. tases 47 47 
1U.S. Dept. Agr., Bur. Chem. Bul. 107, Rev., p. 41. 
2U. 3 Dept. Agr., Bur. Chem. Bul. 107, Rev., p. 241. 
8U.S. Dept. Agr., Bur. Chem. Bul. 134, pp. 16-17. 
4 Average gures. 
’ Temperature much higher than in the first two experiments. 
