24 FUMIGATION OF APPLES FOR SAN JOSE SCALE. 
_As shown above, all lots of fruit of this variety from the western 
New York orchard were injured by fumigation. The injury increased 
in extent along with the increase in period of exposure. A stronger 
dose for a shorter period of exposure was less injurious than a weaker 
one for a longer period, as seen by comparison of Nos. 54 and 59. 
It will also be noted from Nos. 44, 44a, and 44b that injury does not 
depend upon whether the fruit be dry, wet, or moist at time of treat- 
ment. The injury, in fact, was less pronounced on the moist and 
wet samples than on the dry fruit. The increased injury noted at 
time of second examination of Nos. 52 to 59 was undoubtedly due in 
part to the appearance of the so-called ‘‘ cold-storage scald,’ to which 
this variety is quite susceptible, as shown by the untreated fruit kept 
for comparison. With Nos. 44, 44a, and 44b, the examinations were 
made too long after treatment to avoid danger of confusion of cold- 
storage scald, though it may be said that gas injury was noted. soon 
after treatment. 
As bearing on the possible influence of moderate or excessive 
moisture on fruit at time of fumigation, the following tests are 
brought together, in part from other tables, and some are not else- 
where presented: 
TaBLeE VIIl.—Effect of fumigation with hydrocyanic-acid gas on fruit in a dry, moist, 
and wet condition. 
Rate at 
Experi- ) ees won. | Which po- Length 4 - 
ment | Variety of apple. Kaud Ee ale Seo eon tassium of ex- 2 oat o8 pee oa 
used. 
Gr.per cu.ft. Hours. | 
AO S62 York Imperial... 4 bu. basket; fruit dry-.-.-- 15 1 | No record: .-.- No injury. 
AQ ae eee yeas Once ae + bu. basket; fruit wet--..- 1.5 ile Soe do: Do. 
ee Rhode Island | 4 bu. basket; fruit dry-.--- 0. 30 14 All deadiees =n Badly in- 
Greening. jured 
ae ere ee C6 0 eee cere eae 2 bu. basket; fruit moist- - - 0. 30 IP cee Orca Do. 
Aa De sete ess do_-s-2. 4.2. .|'4 bu. basket; fruitjwet__==— 0. 30 pt eta dose Do. 
DO Se Baldwins 2 =-2-= Barrel: inuitewets- 2-3 = 0. 30 1 | One doubtful . No injury. 
a Se =k ee do. Barrel; fruit moist. .-..-..- 0. 30 1 | “Aditdead==] 5 Do. 
=U aie Nae 5 (0 ee me a Nee GOs ee So eae 0. 30 eect Gout eer Do. 
Oe ace eee One en tls GL eee ee re cers eer 0. 30 the Seowe dO Do. 
Sy seen eee Gove se eee OE see re ae ee ee 0. 30 1G) eee do Do. 
aCe ae eet GOs sss sae aeeee Oe tas Se eee 0. 30 1 Goss: st =e Do. 
COLD-STORAGE SERIES. | 
In order to test the fumigation process upon a larger scale, approxi- 
mating what might obtain in commercial practice, a larger fumi- 
gatorium was constructed, 6 by 6 by 8 feet. The sides, ends, and 
top were made separately, using 2-inch square lumber for the frame- 
work. These frames were covered with 10-ounce duck, which was 
treated with two coats of boiled linseed oil. Previous to bolting the 
frames together, strips of heavy felt cloth were glued where the 
frames came in contact, giving a very tight union. On the floor, a 
