4 oo INVESTIGATION BY CULTURE EXPERIMENTS 



TABLE 713. MANGEL-WURZEL ON BARN FIELD, ROTHAMSTED 

 Yield per Acre of Roots, in Long Tons (2240 Ib.) 



These data are presented for examination by the reader, and only 

 a few special points will be referred to here. The records of 1885 

 and 1901 are not included in the averages because, owing to un- 



