554 
Journal of Agricultural Research 
Vol. V, No. 13 
Table IV .—Changes in the composition of sweet potatoes at §° C.—Continued 
SECOND EXPERIMENT (SECOND PERIOD) 
No. of 
sweet 
potato. 
Moisture. 
Reducing 
sugar as 
glucose. 
Difference. 
Cane sugar. 
Difference. 
Starch. 
Difference. 
88a. . . 
88b.. . 
Per cent 
Per cent 
Per cent 
Per cent. 
71. 16 
69.99 
1. 90 
39 
} -0-51 
/ 3- *2 
l 5 - 45 
} 2.33 
/ 19 . 23 
\ 17. 62 
| —I. 61 
90a. . . 
72.32 
2. 06 
} - -27 
f 2. 82 
} 1-99 
/ 18. 04 
1 
90b. . . 
71. 08 
1. 79 
l 4* 8l 
1 16. 62 
j -1.42 
91a.. . 
73 - So 
2. 40 
} -- 15 
f 2. 40 
| 2. 46 
/ 17 . 04 
} -2- ss 
91b. . . 
74-43 
2.25 
\ 4 .86 
l 14*49 
92a. . . 
74-43 
1. 67 
} .as 
} 2.30 
/ J 5 * 7 2 
1 
92b. . . 
75 - 24 
1. 92 
i S-2I 
l * 3 * 5 1 
> —2. 21 
93 ?. . • 
70 - 65 
2. 04 
l jg 
j 3*40 
} J *99 
/ 19* 48 
} -i- 9 ° 
93b- 
71-43 
1. 86 
J ,l8 
l 5*39 
17.58 
94a. . . 
73- 26 
2. 08 
—. 20 
/ 3*66 
} i *93 
/ 16.07 
| -1.46 
94b... 
73 - 16 
1.88 
l 5*59 
l I 5 * 5 1 
THIRD EXPERIMENT (FIRST PERIOD) 
I25a . . 
125b. . 
126a . . 
126b. . 
127a . . 
127b. . 
128a . . 
128b. . 
129a . . 
129b. . 
130a . . 
130b. . 
75- 81 
a 74 
f 0, C 7 
J 3*04 
I 1.88 
/ I S- 77 l 
76.31 
31 
I 0 4 
l 4.92 
l *3- 39 J 
74-SS 
74- 72 
.98 
1.40 
| .42 
/ 3*43 
l 4.87 
} i .44 
r 16. 79 1 
l 14-83 / 
74.27 
74-52 
1.19 
1.44 
} -2S 
/ 3.48 
l 5*20 
} i *72 
r 16.89 f 
l 14- 57 / 
74.87 
74. 80 
£2 
} - S? 
/ 3*01 
l 4.21 
| 1.20 
r 16.78 1 
\ 14. 86 / 
76.38 
1.16 
| . l8 • 
f 3*32 
J* 1.18 • 
f 14. 62 \ 
76 . OO 
i *34 
l 4.50 
{ 12. 84 J 
72- 65 
.87 
} -35 ' 
r 3.62 
} I- 25 • 
f 18. 69 \ 
73-69 
1. 22 
1 4.87 . 
[ 16. 46 J 
“2. 38 
— I. 96 
-2. 32 
— I. 92 
-I. 78 
-2. 23 
THIRD EXPERIMENT (SECOND PERIOD) 
131a . . 
73- 95 
1.44 
/ 4.67 
l h Ah 
/ 14- 67 
} -2.43 
131b. . 
72. 90 
1.25 
| —0.19 
j 7*34 
J 2. 67 
\ 12. 24 
I33a .. 
76.15 
1. 49 
} -53 
/ 4.36 
} i-9° 
/ *3- 
} "2. 59 
I33b. . 
77.19 
2. 02 
\ 6.26 
1 10.51 
134a . . 
75.28 
1. 89 
| .22 
/ 4.26 
| 2.12 
/ J 3*94 
} -2. 69 
134b. . 
76. 32 
2. 11 
l 6.38 
l n.25 
137a . . 
73- 85 
1. 58 
} -°9 
r 4.60 
} r - 9° 
/ r 5* 7 1 
} ~2. 54 
137b. . 
73-63 
1. 67 
l 6. 50 
l 13* 17 
138a .. 
72.71 
i* 55 
} - .11 
/ 4* 9 1 
} 2.49 
( 16.26 
} "2. 59 
138b. . 
73-40 
1.44 
1 7*40 
1 *3* 67 . 
139a .. 
75-55 
15 
} - -3! ' 
f 5* 61 
\ T 
r 12.96 
139b. . 
73- 28 
.84 
l 7*2i 
f I. 00 ■ 
i 11.66 . 
1 -1.30 
In the third experiment at 5 0 , which was carried out with potatoes 
that had been left in the ground for some time after the vines had been 
destroyed, the conversion of starch took place during both periods as in 
the other two experiments, but in contrast with these the accumulation 
of cane sugar took place not only in the second but also in the first period. 
At the same time there was a slight increase in reducing sugar during 
the first period and scarcely any further increase during the second. A 
