AND ITS RELATION TO ANIMAL LIFE 125 



crop which is to make the humus be of a normal 

 character and not chlorotic. 



Further, it appears as if the constituents of 

 a normal humus taken up by a plant would 

 be much more fatal to this or any other fungus 

 than the component parts of a chlorotic humus 

 would be. 



In fact, it appears as if it is not one special 

 point that is going to render the host im- 

 mune to a given parasite, but the combination 

 produced by a perfect or normal chemistry 

 that constitutes immunity in the host. 



And it is certain that a poor soil wanting in 

 humus is not to be rendered truly fertile by a 

 dressing of a few cwts. of artificial manures 

 per acre, nor is it at all likely to produce a 

 normal vegetable growth. 



SUGAR CANE 



I would like to point out that the sugar yield 

 of Natal has fallen from five tons per acre 

 down to as low as two tons per acre, and while 

 I understand the yield for 1903 is estimated 

 at four tons, still on the average it requires 

 careful cultivation to obtain from two to three 

 tons per acre. This is a most practical way of 



