196 ANNUAL REPORT OF THE Off. Doc. 



co-operation of over 100 farmers, and this year there are over seventy- 

 five tests for corn and potatoes in progress. Part of the tests 

 of this year, I am glad to say, are repetitions of those made last 

 year. It is important that the results through several seasons be 

 obtained, since fertilizer effects are very considerably influenced by 

 the character of the season. It has not been possible as yet to 

 report the details of these co-operative tests. I have, however, 

 called out some of the more interesting results. 



