RHODE-ISLAND-GREENING EXPERIMENTS, 1906-7. 23 
ing variety, used in this instance, is noteworthy, in view of the invari- 
able injury noted with this sort from western New York. 
The following day, December 1, additional fruit of all of the 
varieties above listed in the table was fumigated, using gas, however, 
at the strength of 0.50 gram of potassium cyanid per cubic foot—an 
excessive amount. A final examination of this fruit, January 5, 
showed that no injury had resulted in the use of gas at this strength, 
including the Rhode Island Greening. 
RHODE-ISLAND-GREENING-INJURY SERIES. 
The injury resulting from fumigation to the Rhode Island Greening 
variety from western New York required further tests to determine, 
if possible, a strength of gas or period of exposure which, while 
effective against the scale, would not cause injury to the fruit. The 
experiments bearing on this subject are brought together in Table 
VIE. 
Nos. 44, 44a, and 44b, while made to determine the relative effec- 
tiveness of the gas on scales on dry, moist, and wet fruits, are here 
inserted as bearing on the subject in hand. All the fruit was from 
the same orchard and kept under the same conditions. It arrived 
in Washington from the orchardist on October 18, and was at once 
placed in cold storage until fumigated. 
Nos. 44, 44a, and 44b were fumigated December 1, 1906, and Nos. 
53 to 59, January 22, 1907. Subsequent to fumigation fruit was 
kept in the storage house on the Agricultural Department grounds, 
as described. The further details are given in the table below. 
TaBLE VII.—Effect on the Rhode Island Greening apple of different strengths of hydro- 
cyanic-acid gas, with different periods of exposure. Fruit loose in one-third bushel 
baskets. 
i | 7 
Effect on fruit. 
Rate at | hii Total 
Experi-| my ; which po- Length Daron | aaa 
area Condition of fruit. a hs examination. | Number | Number | Number | ber of 
gente reer |P x badly slightly | showing | apples. 
: | injured. | injured. no injury. 
| a 2 tie ei 
| Gr.per cu.ft.| Hours. | 
Bete Oo) Date eee | 0.30 | iN Opto oweeoneee 9 17 | 24 50 
44a... WMGIStES oe ee 0. 30 ieee dow nics | 3 14 19 36 
AVN) econ WEVVIC Teer ae attest 0. 30 eal eseae do. Sa6508 55 3 14 | 17 34 
eee Slightly moist..... OST eves ees | ; se ae a 
e aH oy vets A= ab sosoe | 16 18 oo | ewes egos 
Boreas 2) gee lQeegees ecco Oats : Feb. eas | 19 23 7 49 
ye UES Aso5.e3 saul 22 19 A Ea Peery kis 
Desceesseees Oarehe aca | O18 scp ae | 28 20 4 52 
x | P ian 28 aen See 4 19 20,2. See 
DEse [boca osoten eLeueHe Oaew l Ieb. EE ies | 4 25 19 48 
: (Janie OB uc ae 19 19 Tileaneae 
Uoabend Peres CWeccoeeated som | UE AD 4 Feb. dno 19 21 5 | 45 
- Widens Weis da eooes 31 12 B) lodeceoce 
oo er MDs sescce cose ae : Feb. do. 40 8 0 48 
= ENO oes wae | 16 15 Sil ee 
Bes oce| saee= Westie deo eck Yes : treb, ae | WG 5 | 46 
Ge ASocacaccs | 2 15 rahe lle epee 8 
Deco haat eaases sects 030 2 (eben 5 16 38 56 
| (Uae? Sasa es | 0 0 0 43 
Check..).... 2... 222-0222. | Not treated)....... Una oseeoses se | Many fruits showing scald. |.......- 
