88 HOW CROPS FEED. 
. This quantity was very irregularly distributed among the 
months. In 1855 the smallest amount was collected in 
January, the largest in October, the latter being nearly 
20 times as much as the former. In 1856 the largest 
quantity occurred in May, and the smallest in February, 
the former not quite six times as much as the latter. 
The following table gives the results of Mr. Way entire. 
(Jour. Roy. Ag. Soc. of Eng., XVII, pp. 144 aud 620.) 
Amounts orf RAIN AND OF AMMONIA, NiTRIC ACID, AND TOTAL NirrocEen 
therein, collected at Rothamstead, Eng., iu the years 1855-G—calculated per 
acre, according to Mesers. Lawes, Gilbert, and Way. 
Quantity oF Rain! Ammonia | Nétric | Total Ni- 
in Imperial Gal in acid in \trogen in 
ees 10 grains. | grains. | grains. 
1855 | 1856 11855; 1856 |185) 1956) 1855) 1856 
18.523]  62.952/1244| 5005 | 230:1561|1084| 4596 
January..... 
February . 22.473) 30.586/2337/ 4175 | 944! 544/2169) 3579 
March... 52.484) 22.'722/4513) 2108 )1102) 806)3995) 1945 
April . 9.281} 59.083/1141) 8614 | 325/1063)1024| 7369 
ay... 52.575] 106.474/4206)/18313 1840/3024 3939 15863 
dune.. 41.295) 43.253/5574) 4870 |3303/ 2046/5447) 4540 
duly... 157.713} 33.561/9620} 2869 /2680/1191|8615} 2670 
August. 59.622) 59.859/4769] 4214 8577) 2125 4870) 4021 
September 34,875) 47.477/3313) 5972 | 732/1'%56/2917) 5373 
October.. 124.466} 65. 033) 1592) 3921 |4480,2075! 7414) 3767 
November ..-| 59.950] 32.181/3021] 2591 |1007/1371|2749' 2489 
December.............:-.0e0e ee 39.075) 50.870 2433 4070 664 2035 2180) 3352 
DOU aie is sssbessasas s ayaecastie ae 8 663. 332| 616, 051/711 9.53 |2.98:2.80/6.63) 8.31 
gall's. | gall’s, Hbs.| Tbs. Ilbs. libs. Ibs. Ibs. 
According to Pincus and Rillig, the atmospheric water 
brought down at Insterburg, in the year ending with 
March, 1865, 7.225 lbs. av. of nitric acid per English acre 
of surface. 
The quantity of nitrogen that fell as ammonia was 
8.628 lbs.; that collected in the form of nitric acid was 
1.876 lbs. The total nitrogen of the atmospheric waters. 
per acre, for the year, was 5.5 lbs, The rain-fall was 
392.707 imperial gallons. 
Bretschneider found in the atmospheric waters gathered 
at Ida-Marienhiitte, in Silesia, during 12 months ending 
April 15th, 1866, 33 lbs. of nitric acid per acre of surface. 
In Bretschneider’s investigation, the amount of nitrogen 
