FUMIGATION AGAINST GRAIN WEEVILS 



11 



Table 2. — Formulas, molecular weights, boiling points, and lethal concentrations 

 (from results in Table 1) of fumigants — Continued 



Fumigant 



Formula 



Mo- 

 lecular 

 weight 



Boiling 



point 



Lethal concentration 

 (molar percentage) 



S. 

 oryza 



S. 

 gran- 

 arius 



Tri- 

 bol- 

 ium 



Plo- 

 dia 



Ethers: 



AcetaL 



Chloromethyl ether.. . 

 s-Dichlorom ethyl 

 ether. 



Chlorohydrins : 



Ethylenechlorohydrin 

 Epichlorohydrin 



Sulphur compounds: 



Carbon disulphide 



Ethyl mercaptan 



n-Butyl mercaptan ... 



Methyl sulphide 



Ethyl sulphide 



Methyl thiocyanate.. 



Ethyl thiocyanate 



Allyl isothiocyanate . . 

 Cyanogen sulphide... 



Mercaptol 



Perchloromethyl mer- 

 captol. 



p-Toluenesulphochlo- 

 ride. 



NlTRILES AND ISONI- 

 TRDLES: 



Acetonitrile 



Propionitrile 



n-Valeronitrile 



Phenylisonitrile 



Phenylacetonitrile 



Nitrites: 



n-Butyl nitrite 



Isoamyl nitrite 



Nitro compounds: 



Nitromethane 



Nitrobenzene 



p-Chloronitrobenzene 



m-Dinitrobenzene 



a-Nitronaphthalene . . 



Amines: 



Diethylamine 



n-Butylamine 



Aniline 



Methylaniline 



Dimethylaniline 



Ethylbenzylaniline. . . 

 Acetphenylenediamine 

 a-Naphthylamine 



Miscellaneous nitrog- 

 enous compounds: 



Pyridine 



Hexamethylenetetra- 

 mine. 



Inorganic compounds: 



Carbon dioxide 



Thionyl chloride 



CHaCHCOCjHsh. 



CH2CIOCH3 



CHaClOCHaCl... 



CH2CICH2OH. 

 C 3 H 6 C10.. 



CSa 



C2H5SH.-. 

 C4H9SH... 

 (CH 3 )jS.._ 

 (C2H 6 )aS.. 



CH3SCN.. 

 C2H5SCN. 

 C3H5NCS. 

 (CN)aS... 



(CH 3 )2C(C6H5S)2. 



CCljSCl 



C7H7SO2CL 



CH3CN 



CaHjCN 



CHiCN 



C 6 H 6 NC 



CeHjCHaCN. 



C4H9NO2-. 

 CsHnNOa- 



CH3NO2-— 

 CdHjNOa.... 



CIC8H4NO2- 

 C ( H t (N0 2 )i. 

 C10H7NO2... 



(CaH^aNH 



C4HdNH2-- 



CnHsNHa 



C5H5NHCH3 



C 6 H 6 N(CH3)a 



CsHsN (CaH 6 ) CHaCeHt . 

 NHaCoLLNH C O CHs . . . 

 CioiLNHa 



CsHjN... 

 C«HiaN 4 . 



COa— 

 SOClj. 



118. 142 

 80. 510 

 114. 962 



80. 510 

 92. 515 



76. 125 

 62. 118 

 90.160 

 62. 118 

 90. 160 

 73. 102 

 87.123 

 99.128 

 84.086 



260.323 

 185. 905 



190. 611 



41. 042 

 55. 063 

 83.105 

 103. 083 

 117. 104 



103. 100 

 117. 121 



61. 037 

 123. 078 

 157. 530 

 168. 078 



173. 114 



73. 116 

 73. 116 

 93. 094 



107. 115 

 121. 136 

 211. 219 

 150. 136 

 143. 130 



79. 073 

 140. 158 



44.005 

 118.980 



°C. 



102-104 



55-60 



100-108 



126-127. 

 115-117. 



4.3 



*2.2 



1.1 



4.3 



<2.2 



1.1 



1.7 



4 2.2 



1.1 



46.. 



34.5-35.5. 



38-39 



92-93 



130-131 — . 

 146-147.... 

 143-151.... 

 (Sublimes 

 30-40°) 



4.09 



1.0 



419.0 



.9 



10.4 



2.9 



.1 



4.10 



1.1 



419.0 



2.0 



10.4 



2.9 



.14 



1.0 



4.3 



.10 



1.1 

 419.0 

 2.0 

 9.5 

 2.3 

 .14 



1.0 



419.0 

 2.0 



4.3 



146.5-148. 



145-146 (15 

 mm.) 



76-82... 

 96-97... 

 139-141. 

 165-166. 

 231.7— 



5.0 



5.0 



77-79. 

 96-99. 



98-101. 

 209.4. . 

 242— 

 297— 

 304— 



1.1 

 ..... 



.6 



4.6 



3.6 



5.0 

 "I.T 



1.4 

 3.6 



1.0 



.8 



3.6 



55-56— 

 76-78— 



182 



193.5... 



192 



285-286. 



4.5 



300. 



116-118—. 



.S3 



.83 



-78.5. 

 78 



50.0 

 4 4.5 



4 4.5 



100.0 

 4 4.5 



4 4.5 



4 Minimum concentration tested. 



HYDROCARBONS 



Against grain weevils, a 100 per cent kill was obtained with amy- 

 lene at a concentration of 40.31 per cent, with cyclohexane at a con- 

 centration of 13 per cent, and with benzene at a concentration of 3.8 

 per cent. Against all of the insects except Tribolium, kerosene, tolu- 

 ene, o-xylene, naphthalene, and anthracene were not more than 75 per 

 cent effective. 



Trill at and Legend re (26) found that benzene and toluene vapors 

 at a concentration of 10 grams per cubic meter were insufficient to 

 kill mosquitoes after exposure for an hour at 20° to 28° C. 



Jloll ('.)) tried the efFoct of benzene, toluene, xylene, naphthalene, 

 anthracene, "benzoline," heptane, petrol, petroleum ether, and par- 

 affin oil (boiling point, 150° to 289° C), in concentrations of 1 drachm 



