336 
The Philippine Journal of Science 
1920 
solution of freshly slaked lime has a complete killing effect 
against Pseudomonas citri in minutes, in the absence of 
organic compounds. Copper sulphate under identical conditions 
required a 0.5 per cent solution to kill Pseudomonas citri en- 
tirely in 2\ minutes. 
Table 11. — Results of exposures with 3-day-old culture of Pseudomonas 
citri dilutions of a solution of commercial quicklime in water. Stock 
lime solution, 4 pounds to 50 gallons water. 
[Date of test, August 13, 1920 ; date of observation, August 16, 1920.] 
Exposure. 
Dilution expressed in percentage. 
10. 
20. 
30. 
40. 
60. 
60. 
70. 
80. 
90. 
100. 
Min. sec. 
2 30 
5 00 
7 30 
10 00 
12 30 
15 00 
a Exposure tested on potato, August 16 ; negative, August 18. 
This test was repeated with more dilute solutions of lime, 
and the results are shown in Table 12. 
Table 12. — Results of exposures with 3-day-old culture of Pseudomonas 
citri in dilutions of a solution of commercial quicklime in water. 
[Date of test, September 3, 1920 ; date of observation, September 6, 1920.] 
A number of tests with Burgundy mixture 5 were also made. 
Burgundy 3-3-50 mixture, in which sodium carbonate is very 
slightly in excess of the amount necessary to precipitate the 
c Burgundy mixture is prepared by precipitating the copper from a 
copper sulphate solution with sodium carbonate. 
