40 



THE SCIENTIFIC PRINCIPLES 



Rothamsted Field Experiments. 



and recorded ; the ashes themselves being preserved 

 for reference, or analysis. 



In a large proportion of the samples the total 

 nitrogen is determined; and in some the amount 

 existing as albuminoids, amides, and nitric acid. 



In selected cases, illustrating the influence of season, 

 manures, exhaustion, &c, complete ash-analyses have 

 been made, numbering in all more than 700. 



Also in selected cases, illustrating the influence 

 of season and manuring, quantities of the experi- 



1 Including i year Fallow. 



2 Including I year Wheat, and 5 years Fallow. 



3 Including 4 years Fallow. 



4 Including 2 years Fallow. 



5 Clover, 1 2 times sown, 8 yielding crops, but 4 of these very small, 1 year 

 Wheat, 5 years Barley, 1 2 years Fallow. 



6 Including Barley without manure 3 years (nth, 12th, and 13th seasons). 



