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for field plats. This would perhaps usually give a fair 

 indication of the xmiformity of the land. But in the 

 opinion of the writer a record of the growth of the same 

 crop "by plats for the year preseeding the commencement of 

 the experiment would be far more dependable. It should 

 be remembered that the moisture capacity is only one 

 of the factors which affect the amoxmt of water which the 

 plants receive. Capillarity is a most important factor 

 and varies markedly in different soils. On the other 

 hand the productive ciapaoity determined by growing a 

 previous crop is subject to error from experimental var- 

 iation, difference in seasons aaid change in profluctive 

 capacity, even relatively, froin season to season. Under 

 some conditions this latter variation may be very marked. 

 Where it is not possible to secure the yields a previous 

 season, the determination of the moisture capacity would 

 seem to be of value . 



