New YorK AGRICULTURAL EXPERIMENT STATION. ie ii 
the alcoholic fermentation is hastened by the use of yeast and the 
acetic fermentation favored by the proper temperature and addi- 
tion of a vinegar “starter,” it is possible to produce good mer- 
chantable vinegar in casks in 6 to 12 months. In vinegar facto- 
ries the formation of acetic acid is greatly hastened by the use 
of “generators,” in which the alcoholic liquid is brought into 
intimate contact with a large supply of air. In the hands of 
the ordinary farmer, making only a few barrels of cider, these 
generators would probably not be found entirely practicable in 
every way. 
CARE OF CIDER VINEGAR. 
When the acetic fermentation has gone far enough to produce 
4.5 to 5 per ct. of acetic acid, then the barrels should be made 
as full as possible and tightly corked, in order to prevent destruc- 
tive fermentation of acetic acid and consequent deterioration of 
the vinegar. 
APPENDIX. 
In the following pages, we give the full details of the analyti- 
‘cal results and also the special conditions of experiment in each 
of the 36 experiments described in the bulletin. 
EXPERIMENT 1.—Juice PRESSED FROM NorTHERN Spy APPLES 
Novemeer 10, 1897; Srorep 1n 10-GaLLON CasK IN CELLAR; 
STRAINED AT END oF Srx MONTHS AND REPLACED IN CLEANED CASK. 
Age Redue Aleohol | Volatile | Fi 
. = , ixed 
ben ona Solids. | Ash. | Nitrogen.| ing Sucrose.| by acid as | acid as 
lyzed 2 sugars. weight. | acetic. malic. 
Mths. Per ct. | Per ct. Per ct. Perct. | Per ct. Per ct. | Per ct. Per ct. 
Fresh | 1.0640 15.24 0.19 0.015 10.08 2.69 0.00 0.02 0.52 
1 | 1.0640 15.10 0.19 0.015 10.08 2.48 0.04 0.04 0.50 
2 | 1.0363 10.05 0.19 0.009 7.83 0.28 2.84 0.06 0.48 
3 | 1.0200 7.12 0.22 0.005 | 4.95 ORT 4.23 0.20 0.46 
4 | 1.0079 4.85 0.24 0.004 | Poet ith 0.01 5.52 | 0.16 | 0.46 
5 | 0.9985 2.39 0.24 0.003 0.78 0.00 | 6.74 0.16 0.45 
6 | 0.9980 2.30 0.25 0.002 0.22 | 6.84 0.10 0.46 
7 | 0.9978 2.25 0.25 0.002 0.13 | ——— 6.79 0.17 0.42 
8 | 0.9982 2.12 0.24 0.002 — 6.31 0.38 0.44 
9 | 0.9988 2.15 0.24 SSS | 5.74 0.84 0.24 
i0 | 0.9992 1.98 0.24 oP433 1.01 0.02 
14 | 1.0005 6 0.23 — | ———_ 4.10 2.33 0.03 
15 | 1.0032 1253: 0.24 —— | ———_ 3.69 2.18 0.02 
21 | 1.0081 — _| ——— 2.92 3.93 0.02 
24 | 1.0149 1.58 0.26 0.001 | ———— | ———— 1.05 6.14 0.02 
27 | 1.0158 1.56 0.29 ——_ | ———_ 0.91 6.39 0.02 
29 | 1.0158 1.66 0.26 ——-_ | ———_ 6.47 0.02 
33 | 1.0196 1.63 — | ———_- 0.00 C16 0.02 
36 | 1.0202 1.58 | ——— ——— | —— That fh 0.01 
44 1.60 | —— ————S | o 7.97 
