322  New  Determinations  of  Ammonia,  Chlorine,  and 
monthly  mixtures  are  arranged  in  two  columns  ; one  including 
only  recent  analyses,  in  which  the  ammonia  was  determined 
shortly  after  the  completion  of  each  mixture  ; the  other  including 
also  the  analyses  of  older  samples,  not  analysed  till  June 
1881.  The  average  amount  of  nitrogen  as  ammonia  in  the 
freshly  analysed  samples  is  0'316,  and  in  the  whole  series  of 
samples  0340  per  million. 
The  ammonia  is  thus  somewhat  higher  when  the  determina- 
tions in  the  old  samples  are  included  in  the  average,  a result 
which  perfectly  agrees  with  what  has  just  been  stated  as  to  the 
increase  in  the  quantity  of  ammonia  by  keeping. 
In  Table  IV.  the  whole  of  the  determinations  in  monthly 
mixtures  are  grouped  according  to  the  quantity  of  the  rainfall, 
and  the  results  for  the  summer  months  (April  to  September) 
are  given  separately  from  those  of  the  winter  months  (October 
to  March). 
Table  IV. — The  Average  Amount  of  Nitrogen  as  Ammonia  in 
Monthly  Rainfalls  of  different  Quantity,  in  Summer,  Winter, 
and  the  Whole  Year. 
Summer  Months. 
Winter  Months. 
Whole  Year. 
Nitrogen  as 
Nitrogen  as 
Nitrogen  as 
Groups  of  „j 
Ammonia. 
Ammonia. 
m 
Ammonia. 
Rainfall.  — 
Mean 
Mean 
£ 
Mean 
Rain- 
»— < 
Kain- 
Cm 
Rain- 
i «3 
fall. 
Per 
Lbs. 
fall 
Per 
Lbs. 
a 
fall. 
Per 
Lbs. 
w 
Mil- 
per 
Mil- 
per 
W 
Mil- 
per 
lion. 
Acre. 
lion. 
Acre. 
lion. 
Acre. 
In. 
lbs. 
In. 
lbs. 
In. 
lbs. 
Below  1 inch  . . 2 
0-87 
•890 
•175 
5 
0*81 
■750 
•137 
7 
0-83 
•792 
•148 
1 to  2 inches. ...  7 
1*65 
•527 
•197 
5 
1*32 
•468 
•139 
12 
1*51 
•506 
•173 
2 to  3 inches. ...  7 
2-23 
•537 
•272 
3 
2*59 
•278 
•163 
10 
2*34 
•451 
•239 
3 to  4 inches..  ..  4 
3*62 
•410 
•335 
8 
3*44 
•263 
•205 
12 
3-50 
•314 
•248 
Above  4 inches  . . 5 
5*32 
•287 
•346 
4 
5*30 
•206 
•247 
9 
5*31 
•251 
•302 
25 
2*80 
•423 
•268 
25 
2*69 
•296 
•180 
50 
2*74 
•361 
•224 
The  gradual  decrease  in  the  proportion  of  ammonia  per 
million  of  rain  as  the  rainfall  of  the  month  becomes  greater, 
is  plainly  shown  by  these  figures ; the  quantity  of  ammonia 
brought  down  per  acre  nevertheless  rises  with  each  increase  in 
the  quantity  of  rainfall ; but,  taking  the  figures  for  the  whole 
year,  it  requires  the  rainfall  to  be  increased  about  sixfold,  in 
order  to  double  the  quantity  of  ammonia  contributed  to  an  acre 
of  land. 
The  higher  proportion  of  ammonia  in  summer,  and  the 
larger  quantity  contributed  per  acre  in  the  rainfall  of  this 
season,  is  very  evident,  and  requires  no  comment. 
We  have  now  described  the  results  afforded  by  the  new 
determinations  of  ammonia  in  rain.  The  analyses  of  daily 
rainfalls,  extending  over  rather  more  than  six  months,  have 
