Mar. 8, 1924 
Hastening the Coloration of Lemons 
765 
Lot D .—Same treatment as lot C, except that the concentration of 
ethylene was i to 200,000. 
Lots E and F .—These control lots received no gaseous treatment but 
in other respects were handled in the same way as lots C and D. 
Every other day the fruit was removed from the desiccators and 
aerated for one-half hour. The air in the desiccators was forced out by 
filling them with water, the fruit was replaced, and a current of air was 
aspirated through the system for 1% hours, the carbon dioxid being 
absorbed in barium hydroxid solution. From the data thus obtained 
the number of milligrams of carbon dioxid per kilogram per hour was 
calculated. The results are shown in Table I and graphically in figure 3. 
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Fig. 3.— Effect of stove gas and of ethylene on respiration of lemons. 
The respiration was increased by both ethylene and stove gas, the per¬ 
centage increase being from 150 to 250 per cent. No essential difference 
between ethylene and stove gas with respect to the increase in respiration 
was shown. Further experiments are needed to decide this point. 
• 
Table I .—Effect of ethylene and of stove gas upon respiration of lemons 
Lot 
No. 
| 
| Weight 
1 of fresh 
! fruit. 
! 
Treatment. 
Rate of respiration. 
Start. 
Second 
day. 
Fourth 
day. 
Sixth 
day. 
Eighth 
day. 
Gm. 
Millign 
ims of car bo 
>n dioxid pet 
' kilogram p 
er hour. 
A 
707 
Stove gas. 
12. 3 
i 5 - 1 
34-9 
26. 4 
35-8 
B 
699 
.do. 
II. 2 
24.3 
28.6 
24. 8 
25.8 
c 
698 
Ethylene, 1 to 10,000.... 
IO. 5 
21. 0 
22. O 
41. I 
30. 6 
D 
649 
Ethylene, 1 to 200,000... 
II -3 
15-4 
29. 8 
28. 8 
32.9 
E 
658 
Control. 
IO. I 
7 - 1 
IO. I 
10. 1 
10. 1 
F 
693 
ii- 5 
9 - 1 
8.7 
12. 5 
9. 6 
