XV, 4 



Oshima: Formosan Termites 



373 



Table XXIX. — Duration of life of worker termites in various neutral oils. 



■ 



Name of oil. 



Time. 



Mean. 





Min. sec. 



163 00 



68 00 



46 00 



1 15 



Min. see. 



126 00 



35 00 



47 00 



40 



Min. sec. 



150 00 



61 00 



46 00 



35 



Min. (m, 

 227 00 



68 00 



47 00 



1 15 



Min. sec. 

 233 05 



Min. sec. 



179 49 



58 00 



46 24 



1 00 







46 00 

 1 15 







Table XXX. — Chemical properties of Niizu, neutral oil. 



Color 



Specific gravity (at 20 c 

 Flashing point (°C.) 

 Fractional distillation : 



Below 170 



170 to 270 



270 to 290 



290 to 310 



310 to 330 



330 to 350 



Above 350 



Residue (weight) 



C) 



Pale yellow. 



0.9091 



97 



Ver cent. 

 0.0 

 1.0 



0.5 



2.3 



32.0 



43.5 



18.5 



1.7 



Five, 10, 15, and 20 per cent solutions of camphor green oil 

 were prepared and were injected into a great number of Japanese 

 pine blocks (2 by 2 by 15 inches, or about 5 by 5 by 38 

 centimeters) by means of full process (about 5 gallons per cubic 

 foot, or about 18 liters per 0.028 cubic meter, of timber) . The 

 treated blocks were buried in ground infested by Coptotermes 

 formosanus, at Shakko, near Taihoku. For twenty-four months 

 there was no damage; but after the lapse of thirty-one months, 

 the blocks treated with the 5 per cent solution were slightly 

 infested. 



Table XXXI. — Results obtained at the final inspection of Japanese pine 

 blocks injected with solutions of camphor green oil. 



[Experiment started August 5, 1914. Blocks inspected March 7, 1915 ; August 8, 1915 ; August 

 28. 1916 ; and March 24, 1917.] 



Solution. 



Blocks. 





Total. 



Infested 



No 

 damage. 



Damage. 





Per cent. 



9 

 8 

 8 

 11 



5 



4 



Per cent. 

 65. 55 





8 j 0.00 

 8 J 0.00 

 11 0.00 



















