Contents. 



PAGE 



CONTINUOUS GROWTH OF WHEAT UPON THE 

 SAME LAND FOB FORTY YEARS WITH FARM- 

 YARD MANURE SUPPLIED EACH YEAR ... 49 

 QUANTITY OF AMMONIA REQUIRED TO PRO- 

 DUCE AN INCREASE OF ONE BUSHEL PER 



ACRE IN THE WHEAT CROP 54 



THE B.OTHAMSTED EXPERIMENTS ON THE 

 CONTINUOUS GROWTH OF WHEAT COMPARED 

 WITH THOSE AT WOBURN, HOLKHAM, AND 

 EODMERSHAM 56 



SUMMARY OF THE RESULTS OF FORTY YEARS' 

 EXPERIMENTS ON THE CONTINUOUS GROWTH 



OF WHEAT UPON THE SAME LAND 58 



IV. INFLUENCE OF CLIMATE ON THE CULTIVATION 



OF WHEAT 32 



V. THE HOME PRODUCE, IMPORTS, AND CONSUMP- 

 TION OF WHEAT 74 



BAELEY. 



VI. EXPERIMENTS ON THE CONTINUOUS GROWTH OF 

 BARLEY UPON THE SAME LAND FOR TWENTY 



YEARS 87 



CHARACTERISTICS OF THE BEST AND WORST 



SEASONS OF THE TWF.NTY YEARS 92 



AVERAGE YIELD OF BARLEY PER ACRE PER 



ANNUM FOR EACH DESCRIPTION OF MANURE 96 

 QUANTITY OF AMMONIA REQUIRED TO PRO- 

 DUCE AN INCREASE OF ONE BUSHEL PER 

 ACRE IN THE BARLEY CROP 103 



EFFECTS OF THE UNEXHAUSTED RESIDUE OF 



MANURES 106 



THE EXPERIMENTS ON THE CONTINUOUS 

 GROWTH OF BARLEY COMPARED WITH 

 OTHER SIMILAR EXPERIMENTS . Ill 



