166 Report OF THE CHEMIST OF THE 
TABLE X XI.—Continued. 
Drying 1 hr. over boiling | Drying to syrup and then drying Drying on sand 8 hrs. fn 
water. 25 hrs. in oven at 212° F. steam oven. 
Per ct Per ct Per ct. 
1.87 1.81 1.70 
1.88 1.78 1.70 
1.91 1.86 1.78 
1.92 1.88 1.79 
1.95 1.88 ey AF 
2.00 1.91 1.81 
2.04 2.01 1.78 
2.10 1.91 eA?) 
2.12 2.26 2.20 
2.13 2.22 27 
CONT 2.20 ly 
2.26 1.98 
2.28 oe 1.97 
EBD) —_—_— 2.08 
2.43 - 2.25 
2.64 DABS 
2.89 2.93 2.65 
2.93 2.95 2.87 
3.06 2.88 2.80 
3.10 SL LS SLO 
3.64 Sia iG 3.70 
6.50 —- | 5.86 
8.59 8.78 7.44 
In studying these data, we notice the following points: 
(1) In general, the highest results were obtained by drying 
one hour on a water bath, and the lowest, by drying on sand eight 
hours in a steam oven. 
(2) Vinegars containing 2 per ct. of solids as determined by 
the first method contained about 1.80 per ct. when determined 
by the longer drying on sand. 
(5) Vinegars containing 2 per ct. of solids by the method of 
drying eight hours contained about 2.25 per ct. when dried one 
hour. 
Since different methods give such varying results that a vinegar 
would be pronounced up to the standard by one method and below 
standard by another method, it would seem desirable that the 
somewhat vague phrase, “solids on full evaporation over boiling 
water,” should be dropped and in its place should be substituted 
a specific statement of the conditions of evaporation. 
From some of our results (experiments 1, 7, 8, 16, 18, 19, 20, 
21, 23, 31, 32, 33, 35), it would seem that a pure cider vinegar 
may contain 4.5 per ct. of acetic acid or more and at the same 
time contain less than 2 per ct. of solids, by whatever recog- 
nized method the amount of solids is determined. 
