16 FUMIGATION OF APPLES FOR SAN JOSE SCALE. 
possible poisoning of the fruit by absorption of the gas. It is be- 
lieved that there is very little, if any, gas taken up by the fruit during 
the process of fumigation—certainly not enough to result in harm to 
the consumer. The writer, his associates, and many others have 
freely eaten of fumigated fruit at various times, and in several in- 
stances the fruit after wiping was eaten within thirty minutes after 
it had been taken out of the fumigating box. 
To insure uniformity in conducting the tests and in recording 
results, a blank form 5 inches by 8 inches in size was used throughout, 
as follows: 
Fruit Fumigation EXPERIMENTS. Ox NO. Meese Exp Nos. -442= 
iocalitiysie ses ar See ee | ee DAC Ee teen Brune. 24 eee 
Wanleliy soc: 225-52 aca ee UG eens oe SOUICE. saan Gee 
SIZ OLAUMISA LOREM So) ae 55 oe re Package; sizes as ee 
Amountsdeducted = o2 user ey Pumigant. rates 5-25.22 Nee eee 
Amounts: of chemicals used 2255-225 3-222 oe ee a ee 
EXPOSURE saa soot ee nae eRe eo ee ee Closed... 3-2 eee 
emp eraturesssesse=-e eee Condition of fruit/as to moisture. 22. --- 222) 
Deoree ol scale infestatiom:=s 2222-2. 252 Saas Se ee ee ee eee 
Condition of scale.betore treatment 352. < 222s eee ee ee 
Results: of treatment: 2. <2. ssc 2e5 es a ee ee en 
Bes Nes ea ea ee, emer Notes*by::22353:5 223. eee eee 
EXPERIMENTS IN 1906-7. 
The fumigation tests with hydrocyanic-acid gas during 1906-7 
may be grouped as follows: 
(1) Strength-of-gas series. 
(2) Length-of-exposure series. 
(3) Package series. 
(4) Variety-of-fruit series. 
(5) Injury-to-fruit series. 
(6) Low-temperature series. 
Except in the sixth series all tests were made in the basement 
room referred to, which was supplied with steam pipes for purposes 
of heating the building, maintaiing a temperature for the basement 
of from 65° to 70° F. An abundant quantity of each variety of fruit 
used was kept untreated to determine the condition of the scales 
from time to time during the winter. The condition of the scales on 
Baldwin and Rhode Island Greening apples during the winter of 
1906-7 is shown in Table II, and in addition to furnishing a basis of 
comparison with the treated fruit will serve to show the increasing 
mortality of the scales as the season progressed. 
