1889.] PUBLIC DOCUMENT — No. 4. 505 



manurial matter during that period. All, except plat 6, 

 were planted during the above-stated three succeeding years 

 with the same variety of corn (Clark). Plat 6 received 

 during that time no fertilizing material ; it was ploughed and 

 worked with the cultivator in the same manner and at the 

 same time when the other plats were thus treated ; it was 

 kept clear, as far as practicable, from every kind of vegeta- 

 ble growth (black fallow). 



The details of the work and of the annual results of the 

 course pursued in the management of the experiment have 

 been described in the preceding annual report. The subse- 

 quent summary may suffice here to record the principal facts 

 brought out before the beginning of the present year (1888). 



