182 ROYAL SOCIETY OF CANADA 



Rain and Snow at Ottawa, for year ending February 29th, 1908. 



Month and Year. 



Precipitation 

 in inches 



Rain 



Snow 



Nitrogen 

 parts per milUon 



1.2 



'eg 



2^ 



Total 



o »■ 



P o « 



I 

 Marcn...; 1907 1.55 



April •' 



♦May " 



June " 



July " 



August " 



September " 



October " 



November., " 



December " 



January 1908 



February " 



2.59 

 1.56 

 2.20 

 3.73 

 1.13 

 3.32 

 2.70 



3.37 



■J 

 .81 



.13 



.96 



11.50 

 7.25 

 7.50 



Total for 12 months.. .24.05 



1.00 

 5.50 

 34.75 

 30.25 

 35.25 

 1 33.00' 



2.70 

 3.32 

 2.31 

 2.20 

 3.73 

 1.13 

 3.32 

 2.80 

 3.92 

 4.28 

 3.16 

 4.48 

 37.35 



2.25 

 .320 

 .082 

 .490 

 .275 

 .369 

 .503 

 .434 

 .349 

 .349 

 1.56 

 .098 



.049 

 .056 

 .033 

 .156 

 .117 

 .102 

 .129 

 .085 

 .063 

 .096 

 .059 

 .053 



.193 

 .120 

 .065 

 .147 

 .145 

 .114 

 .137 

 .193 

 .064 

 .171 

 .149 

 .106 



.467 

 .496 

 .180 

 .793 

 .537 

 .585 

 .769 

 .712 

 .476 

 .616 

 .364 

 .257 



.286 

 .372 

 .094 

 .395 

 .454 

 .150 

 .579 

 .452 

 .423 

 .597 

 .260 

 .261 

 4.323 



* Only one analysis was made this month, the work being interrupted by the 

 making of necessary changes in the^collecting apparatus. 



One or two of the more important facts brought out by the fore- 

 going data may be briefly considered. 



1, The amount of nitrogen in the rain and snow at Ottawa during 

 the year was 4-323 lbs. per acre. Of this, 74 per cent or 3- 199 lbs. was 

 present as ammonia and ammonium salts, and 26 per cent or 1124 lbs. 

 as nitrates and nitrites. 



In this connection it is of particular interest to note that in a 

 paper entitled " Composition of Eain-water at Eothamsted, " (Journal 

 of Agricultural Science, Vol. I, Part 3, Oct. 1905), Dr. N. H. J. 

 Miller reports that the average amount of nitrogen in the forms of 

 ammonia and nitric (and nitrous) acid in the Eothamsted (Herts, Eng- 



