20 



The Philippine Journal of Science 



1913 



water in the generators first, then add the acid, and after closing the 

 compartment lower the cyanide into the mixture. 



4. Never enter the compartment after the evolution of the gas has begun. 



5. In opening the compartment after fumigation, hold the breath and 

 make a hasty retreat. At least fifteen minutes should elapse before re- 

 turning to the vault. 



Sulphuric acid may be purchased from the same sources as 

 potassium cyanide. That of 1.84 specific gravity may be bought 

 at 0.77 peso per kilogram, wholesale in Manila. At the above 

 prices the cost of fumigating 1,400 kilograms of leaf tobacco 

 would be 2.06 pesos. 



In the experiments with the cyanide treatment, tobacco treated 

 with the gas liberated from 32 grams of potassium cyanide per 

 cubic meter of compartment made into cigars and kept under 

 different conditions showed the following results: 



Table X. — Condition of cigars fumigated with hydrocyanic-acid gas {32 

 grams of potassium cyanide per cubic meter) , when kept under different 

 conditions. 



Kind of cigar. 



Num- 

 ber of 

 cigars. 



Date 

 made. 



Date 

 boxed. 



Length 

 of treat- 

 ment. 



Date ex- 

 amined. 



Remarks. 



PerfectoB 



200 

 200 

 200 

 200 



50 

 50 

 50 

 50 



200 

 200 

 200 



July 25 

 -...do... 



July 25 

 ...do .- 



Hours. 



86 

 36 

 36 

 36 



24 

 24 

 24 

 24 



36 

 36 

 86 



July 21 

 July 28 

 Nov. 8 

 Jan. 8 



Sept. 27 

 Nov. 8 

 Jan. 8 

 Jan. 12 



Sept. 27 

 Nov. 8 

 Jan. 8 



Cigars made in general 

 room; guarded in 

 screened room; boxed 

 immediately; all good 

 at each examination. 



Cigars fumigated after 

 being made; kept in 

 screened boxin general 

 drying room; cigars 

 good at each examina- 

 tion. 



Filler was steamed and 

 wrapper treated with 

 cyanide. Made in gen- 

 eral room; kept in 

 screened box in dry 

 room; cigars good at 



. each examination. 



High life... 



Media regalia 



....do .. 



do ... 



....do ... 



....do... 



Conchas especiales _. 



Aug. 24 

 ..-.do... 



Aug. 30 



Londres . 



do 



do 



Boquets 



Panatelas 



....do ... 



....do... 



Sept. 20 

 do 



Sept. 27 

 do 



Republicanos 



Media regalia 



do 



do 







In the laboratory experiments, 30 grams of potassium cyanide 

 were found effective for all stages of the cigarette beetle, as is 

 shown by Table XI. Where eggs were not removed from the 

 leaf on which they were laid, 28 grams per cubic meter for 

 twenty-four hours killed about 95 per cent of them. 



