Report of Experiments on the Growth of Wheat. 145 
excess in the earlier ones, due to the accumulation of many 
previous courses of manuring and cropping. 
These few illustrations will serve to indicate the degree, or 
limit, of the influence of any slight progressive improvement in 
the character of the seasons of the experimental period, and thus 
prepare the way for considering the effects of accumulation, or 
exhaustion, of constituents, from the manuring and cropping of 
preceding, on the produce of succeeding years. 
( To be continued.) 
VOL. XXV. 
Appendix. — Tables. 
l 
