78 
LON A. HAWKINS 
Table V 
Pentosan and Acid Content, and the Amount of Alcohol-Insoluble Substance 
Which Reduces Fehling's Solution when Hydrolyzed with Dilute HCl, 
IN THE Sound and Rotten Halves of Peaches. Each Substance Deter- 
mined in Sound and Rotten Halves of the Same Peach. 
Per Cent Pentosans 
Wet Weight 
Acid Content 
Acid per 100 g 
in cc. Normal 
., Wet Weight 
Per Cent Alc.-Insol. Substance 
(as Starch) Reducing Fehling's 
Sol. When Hydrolyzed With 
Dil. HCl, Wet Weight 
Sound Peach 
Rotten Peach 
Sound Peach 
Rotten Peach 
Sound Peach 
Rotten Peach 
I 
2 
3 
4 
0.57 
0.67 
0.62 
0-59 
0.69 
0.66 
2.45 
4-75 
4-25 
7.40 
7-30 
6.55 
0.83 
0.73 
0.71 
0.85 
0.80 
0.64 
0.67 
0.59 
Table VI 
Reducing Sugar, Total Sugar, and Sucrose Content in the Sound and 
Rotten Halves of Peaches, Stated as Percentage of Wet Weight. 
Reducing 
I Sugar as Glucose 
Total Sugar as Glucose 
Sue 
rose 
Sound He 
ilf 
Rotten Half 
Sound Half 
Rotten Half 
Sound Half 
Rotten Half 
I 
2.47 
4.14 
5-95 
4.26 
3-31 
0.12 
2 
1-35 
1.68 
3-93 
1.88 
2.44 
0.19 
3 
1. 14 
2.63 
3-03 
2.82 
1.79 
0.18 
A third series of analyses v^as begun August i6, using fruit that 
had become infected under orchard conditions. A quantity of peaches 
were picked, some of which bore typical brown-rot spots upon the 
surface. A number of the peaches which were apparently sound 
were selected, the pulp removed from the stones and cut up into thin 
slices. The whole mass was then chopped up into small pieces, well 
mixed and sixteen twenty-five gram samples weighed out, four for the 
determination of each of the various substances. In addition to these, 
three ten-gram samples were weighed out for the determination of the 
total dry matter. These last were covered with 95 per cent alcohol 
in glass-stoppered weighing bottles and the samples allowed to stand 
for several days. Most of the alcohol and water was then driven off 
at about 60° C. The residue was dried to constant weight in an oven 
at a temperature of 100° C. and the amount of dry matter calculated. 
The infected peaches were allowed to remain under warm humid 
conditions for two days after the sound peaches were sampled. At the 
end of this time they were rotten and in most cases covered with tufts 
