The Atmosphere as a source of Nitrogen to Plants. 267 
Ville 
Note. 
Ammonia in One Million parts of Air. 
Grains. 
J 
By day .. 
.. 0-1090 
1 
.By night 
.. 0-0980 
jliOwest .. 
.. 0-0177 
Interior of Paris . . 
Highest 
.. 0-0317 
Mean .. 
.. 0-0237 
Lowest .. 
.. 0-0165 
Environs of Paris .. 
Highest 
.. 0-0276 
Mean . . 
.. 0-0210 
Boussingault 
Barral .. .. 
Ammonia in an Imperial Gallon of Rain- Water, 
(Paris 
0-2100 
iLiebfraucnberg 0-0350 
Paris, mean of five months, August to 
December 0-240 
Ammonia in Snow. 
Grains per gallon. 
Collected on the earth 0-454 
,, on a terrace 0-080 
In water of the Seine 0-0096 
T> . , 1 In sea-water at Dieppe 0-0136 
iJoussmgauit -j ^^^^^ Liebfrauenberg, from 0 - 07 14 
In water of fog at Liebfrauenberg 
„ „ at Paris 
Nitric acid in rain water 
to 
0-4340 
0- 1790 
9-600 
1- 350 
Barral 
Ammonia and Nitric Acid, per acre, in lis., in Bain-Water at Paris. 
Barral 
(Ammonia ^ 9-60 lbs. 
1 Nitric acid 65-18 
These quantities would yield nitrogen, 
In the ammonia 7-90 lbs. 
In the nitric acid 16 '90 
Total nitrogen per acre 24-80 
Notice. 
