The Bulletin. 



50 



Continued. 

 FIELD IN 1908. 



YEARS IN FIELDS A AND B. 



Note. — The check for plat 8, field A, has been obtained from plats 4 and 11, and that 

 for plat 10*, field B, from plats 5' and 14^. It has been assumed that there is a uniform in- 

 crease or decrease in the natural fertility between check plats, and a corrected check was 

 figured on this basis for each treated plat between checks. 



