20 



Table V. 



Nitrogen as Ammonia and Nitric Acid in the Rain of various 



Localities in Europe. 



[Quantities in Pounds per Aero per Annum.] 



Localities. 



Euschen 



Kuschen 



Insterburg 



Tnsterburg 



Dahme 



Regenwalde 



Regenwalde 



Regenwalde 



Ida - Marienhiitte ; mean 



six years 



Proskaw 



Florence 



riorence 



Florence 



Vallombrosa 



Montsouris, Paris 



Montsouris, Paris 



Montsouris, Paris 



Mean, 22 years 



Years. 



1864-'65 



1865-'66 



1864-'65 



1865-'66 



1865 



1864r-'65 



1865-'66 



1866-'67 



1865-'70 

 1864-'65 

 1870 

 1871 



1872 



1872 



1877-'78 



1878-'79 



1879-80 



Rainfall. 



Inches. 



11 85 



17-70 



27-55 



23-79 



17 09 



23-48 



19-31 



25-37 



22-65 

 17-81 

 36-55 



42 -48 

 50-82 

 79-83 

 23-62 

 25-79 

 15-70 



27-03 



Nitrogen as — 



Total. 



lbs. 



86 

 50 

 49 



81 



6-66 

 15 -09 

 10-38 

 16-44 



9-92 

 20-91 

 13-36 



9-89 

 12-51 

 10-38 



11 

 11 



54 

 16 



10-52 

 10-23 



It is seen that the numerous very widely varying determinations, 

 some made in the vicinity of towns and some in the open country, give 

 a mean of 10-23 pounds of combined nitrogen annually supplied per 

 acre by rain with a mean rainfall of 27-03 inches. Making all allow- 

 ance for far inland open country positions on the one hand, and for 

 proximity to towns on the other, the very small amounts of combined 

 nitrogen so supplied per acre in some of the cases, and the compara- 

 tively large quantities in others, seem difficult to explain, or to recon- 

 cile, either with one another or with the results of Boussingault and of 

 Rothamsted. When, however, the comparatively limited and uniform 

 total amounts recorded for Montsouris, within the walls of Paris, are 

 considered, 11*54 pounds, 11-16 pounds, and 10-52 pounds per acre per 

 annum, it will not excite surpi-ise that we should estimate the amount 

 of combined nitrogen coming down in the measured aqueous deposits 



