EFFECT OF LIMESTONE ON NUMBER OF BACTERIA 27 



Exercise 8 

 Effect of Limestone on Number of Bacteria 



1. Fill three tumblers with 100 grams each of field soil. 



2. Arrange as follows: 



(a) Control. 



(b) Treat with 0.5 per cent, of calcium carbonate or one-half enough 



calcium carbonate to neutralize the soil acidity. 



(c) Treat with i per cent, of calcium carbonate or enough calcium 



carbonate to neutralize all soil acidity. 



TABLE 5. E/ect of Limestone on Number of Bacteria 



