396 



Journal of Agriculture, Victoria. [lo July, 1912. 



The four extra bottles of Xos. i and 2 were filled on 22nd February, 

 and tested on 8th March. Period of incubation, fifteen days ; average 

 temperature, 72.9 degrees F. The results are stated in Table IL 



Table II. 



It was seen from these observation bottles that the addition of mild 

 lime had verv greatly increased the rate of nitrification, and it was decided 

 therefore to commence one of the main series as soon as possible. 



Table III. gives the results. The period of incubation here was 

 twenty-one days ; average temperature, 72.1 degrees F. 



Table III. 



Referring to the figures, it was apparent that the acceleration of nitri- 

 fication found in twenty-one days scarcely extended beyond the carbonate 

 of lime, consequently it was decided to leave the duplicate set for another 

 month. The figures of Table III. stand in an interesting relation to the 

 final results, and will be referred to later. 



At the end of fifty-one days, the remainder of the bottles were analvzed. 

 Mean temperature of periods, 69.98 degrees F. The results were as 

 shown on the following page. 



