38 ROYAL SOCIETY OF CANADA 
The annual rainfall at Ottawa has averaged for the past 16 years, 
26.56 inches, practically three-fourths of the whole precipitation. If 
we assume that its nitrogen content is approximately that of the snow, 
we have a total of about 4 lb. of combined nitrogen furnished per acre 
annually from the atmosphere, an amount very similar to that found in 
other countries. 
In concluding this preliminary note on the snow as it falls at 
Ottawa, it may be stated that this work, it is hoped, will be continued 
next winter and that during the next summer the nitrogen content of the 
rain will be ascertained. The present data are interesting but their 
value will be much enhanced by further results of a confirmatory 
character. 
