20 BULLETIN 1313, U. S. DEPARTMENT OF AGRICULTURE 
TABLE 3.—Tozicity of Pion to Sitophilus oryza (arranged in order of decreasing 
effect) Continued 
Minimum Ri 
concentra- Minimum : 
tion caus- | Boi ape etd GC Cost per 
Fumigant ing 100 per oving ~ Causing E ost ‘per 1,000 cubic 
point per cent pound 2 
cent mor- talit feet 
tality in 24 SES 
nounS in 24 hours 
Lbs. per 
Per cent 268 1,000 cu. ft.| Dollars Dollars 
Vie Ghayalat oni ate ase nto Ae A ee 3.90 32. 3 1.51 1. 59 2. 40 
TsoamiyMacetatec’: 22.500 0a so eee oto . 90 139. 0 3. 26 .91 2. 97 
Diethylamines qq! ee aoe sees +90 55. 0 1. 83 16. 33 29. 88 
N=BubYVATMET CAP CAMS = oe ms late eg eed ean . 90 97.0 2. 26 36. 29 82. 02 
A BHEO) 00X0) C0) 00 ey re a ag ee es 3,94 150. 5 6. 62 2. 04 13. 50 
o-.and p-Dichlorobenzene___-._ 2s 1. 00 175. 0 4,10 mally 615 
Carbonidisal phidels 2489. see eee 1.00 46. 0 2.12 . 06 er 
s-Tetrachloroethane- —_.-_..2:-----__--2-__ 1.10 147.0 ils Ve ai 5. 82 
PAV OLETOMIGHUEE 2s ooh ae Desa Fe EUR NER 1.10 141.0 Bs 5 2ieae 69. 41 
s-Dichloromethy] ether_____.____/___2_2___ 1.13 105. 0 3. 62 27. 22 98. 54 
HPAI ONAL Oa) eee 1.70 97.4 2. 85 1. 36 3. 88 
NEBULY Lal COMO]es 2) 2 Ue eN are ie Su equal kage 31.70 117.0 Ch wil . 76 2. 67 
i thylamethivaliketome sume sien eeu nena 31.80 79. 6 3. 62 . 30 1. 09 
Bluorobenzene: 3s 6 pas ie ere bs pose 3 1.90 84. 9 OOO a 3358 se |S Oia ee 
STV OrO DOTaZ STC eee ai asap ie a eae te 2. 00 132. 0 6. 27 . 09 56 
‘C@hloromethyalethers ee es ee 32. 20 59. 5 4,94 13. 61 67. 23 
TaETO DN WACE FAC 5 meee Se TS ae 2. 50 101. 6 eglel a OA 16. 14 
HAS WU UO RovOdUKG Kg Nee Sa 2. 60 101. 0 9. 93 4,54 45. 08 
‘Detrachloroethylenes ss 2s eee ya Bpe 2. 60 121.0 12. 02 is 18? 13. 58 
cB thy Sulphice™ see anhu nies One Nee 2. 90 92. 0 7. 29 227, 16. 54 
TC hyslubo rn maidl © Sees eo aes ee Uae es 2. 90 38. 4 8. 81 .40 3s by 
INitromethane!e ae. ae eo eyes 3. 60 101. 0 6. 12 9. 07 DORE 
EL B65 VAS) 0 = atta IS A a HA Eh i SiS Bt ea 3. 80 80. 2 8. 27 4.04 33 
UU Ploy top aaa yeti Lorene nae rae TEs alana ie 3 3. 90 70. 0 13.15 15. 88 208. 82 
TAP AOONal oOo Os Seat e oN 4,10 70. 8 14. 05 13. 61 191. 22 
INGOTARERK ET Eo Gye Peete apis PUB pias ten 3 4.30 102. 2 14,15 18. 14 256. 68 
Methylene whlorid ess 222 se sue ee 4, 40 47. 6 10. 42 6. 80 70. 86 
Thionylchloride: _ Manse Ea ee eet es 3°4. 50 78. 0 14. 92 9. 07 135. 32 
A GEtOMIGr essiede ls es Bees ee 5. 00 81. 6 7 18. 14 103. 58 
ZF B WAM Kon Ola es Se Se eee 5. 50 77.0 LOS 13. 61 150. 39 
IN thiylene Chlorides Sasa ahs eee ee a 6. 00 83. 5 16. 55 . 68 11. 25 
CGarbonktet Gach! Ori eee eee eer es 6. 90 76. 7 29. 58 .082 2. 44 
Ciorelort PANS to aR ayant ak Nap 7. 00 61. 2 23. 29 .o2 7.45 
PACE TOME: Fe Bee aie Ri Nc ey a 8. 20 56. 5 -13. 27 . 20 2. 65 
Acetylene dichloride Sa ele 2 Se ea 9. 00 55. 0 As oY i aS Ra a Le es 
Trachloroethylenes so) Siar eE is nape 10. 00 88. 0 36. 62 . 36 13. 18 
Héhylidene chlorides... seen aes. ee 10. 20 59. 2 28. 13 22. 68 637. 99 
ING iE aly SVoU Yo} ANC (Se ee IS i ee 10. 40 38. 0 18. 00 45, 36 816. 48 
@yclohexaneite! Sve Gee wpa See ee 3 13. 00 80. 8 30. 48 22. 68 691. 29 
Methyl alcohol sas a2. waa aie cen 16. 00 64. 7 14. 28 5.15 2.14 
Et hiyaln er cal bare eee ee ee eee 3 19. 00 37.0 32. 89 9.07 298. 31 
UNG GGT ASN a Vs tees ae area nent UR a EAE uy eee 40. 30 22-37 78. 76 9. 07 714. 35 
G@ ar bOniGiOxid Cae. es ee ee oer eater ee 50. 00 —78. 5 61. 32 07 4, 29 
3 Minimum concentrations tested. 
4 Chemically pure, in drums, sold for 30 cents a gallon. 
5 Purified, in drums, sold for $1 a gallon. 
While the volatility of organic compounds at ordinary temperatures 
is not proportional to their Doiling points, very few data on the v ape 
pressure of these compounds at ordinary temperatures are availabl 
For that reason the boiling points were used in this investigation. 
The compounds are arranged in the order of decreasing toxicity, 
Moore (15) states: 
In general, the toxicity of a volatile organic compound is correlated closely with 
its volatility. A decreasing volatility is accompanied by an increased toxicity. 
The boiling point of the chemical is a general index of its volatility. Compounds 
with boiling points of 225° to 250° C. are usually so slightly volatile that they, 
do not produce death except after very long exposures. 
If this theory is true, the boiling points of the compounds should 
show a decrease, indicating i increasing volatility, but no well-defined. 
relation between the toxicity and the boiling point is shown in Table 3. 
This is not in agreement with Moore’s theory. 
