41 



total depth of 54 inches. The special object was to 

 determine the difference in the amounts of water at the 

 different depths of the respective plots, with their very 

 varying characters of herbage. In all the samples the 

 nitrogen was also determined. 



In 1876, samples were taken from 22 plots, at 3 

 places on each plot, in each case to the depth of 6 times 

 9, or 54 inches. Nitrogen determinations (by soda-lime) 

 have been made in the mixed sample from the 3 holes 

 in the case of each plot, and of each depth. Some deter- 

 minations have also been made in single samples. In 

 many cases the carbon has also been determined, and 

 sometimes both by the combustion and the chromic acid 

 method. In a few cases also the nitrogen as nitric 

 acid was determined. 



In 1878, samples were taken from 4 selected plots, 

 from 3 places on each, but to the depth of 9 inches 

 only. In the single as well as in the mixed samples 

 from the 3 holes on each plot, the nitrogen has 

 been determined; the carbon has been determined in 

 the mixed samples, and in one case the nitrogen as 

 nitric acid. 



In 1885, samples were taken from 2 selected plots, 

 from 2 places on each, but to the depth of 9 inches 

 only. In the samples from each of the 2 holes the 

 nitrogen has been determined. 



In 1886, 12 samples were taken, 5 from one plot, 

 and 7 from another, to the depth of 9 inches only, 

 specially with the view of tracing the connection be- 

 tween the character of the herbage, and the amount of 

 nitrogen in the soils, and the nitrogen was accordingly 

 determined in them. 



Independently of the annual record of the crop 

 results in the " Memoranda " the results of the grass 

 experiments were reported upon in No. 12, 1858-59, 

 and in No. 19, 1863 ; botanical and chemical, as well as 

 crop results being considered. But the results for the 

 first 20 years (and in some cases longer), have been much 

 more fully discussed in two papers in the " Philosophical 



