COMBINED NITROGEN IN KAIN 



19 



In addition to the analyses of monthly samples of rain, a 

 large number of single samples have been analysed at 

 Rothamsted, as well as about eighty samples by the late Sir 

 E. Frankland.* 



TABLE VII. Nitrogen and Chlorine in Eothamsted Rain. Monthly 

 Averages, 15 years (1889-1903). 



It will be convenient, for the purpose of summarising the 

 results relating to nitrogen, to confine attention to the fifteen 

 years 1889-1903, as during that period regular determinations 

 both of ammonia and nitrates are available. 



In Table VII. will be found the average monthly rainfall 

 for the period in question, the amount of nitrogen as ammonia 

 and as nitrate (or nitrite), also the chlorine, all expressed both 

 as parts per million and as Ib. per acre. Other columns show 

 the relative proportions of the two combinations of nitrogen. 



Reference to the table will show that the average amount 

 of nitrogen in the two forms is 3 '97 Ib. per acre per annum, 



* See the Sixth Report of the Rivers Pollution Commission, 1874. 



