268 



Report of the Special Committee. 



In this series, with Plow No. 69, the average draught of the 

 whole series exceeds the average draught of the series of experi- 

 ments which agree with it in the size of the furrow slice by 62 

 pounds. (Experiments twenty-four, twenty-five, twenty-six and 

 twenty-seven, eight inches deep and eighteen inches wide.) 



Recapitulation of Experiments ivith Plow No. 69. 



The average difference in the draught of each inch in depth was 

 61 pounds. The excess of 75^ pounds of draught in the furrow 

 of 88 square inches over the furrow with 108 square inches is 

 anomalous, and was caused either by an error in reading of the 

 dynamometer indication or by some local obstruction. The 

 {j,nomaly did not appear until the indications were computed, and 

 it was then too late to ascertain the cause of it. This difierence 

 was not, therefore, included in the average of 61 pounds. 



The next set of experiments to determine the rates of draught 

 to depth was made with Holbrook's Plow No. 65, the coulter 

 being adjusted to lay Jlat furrows: 



Surface draught. 



