Improvement  of  Land  by  Warping. 
103 
The  proportion  of  nitrogen  present  in  the  anhydrous  warp 
amounted  to  O'  245  per  cent.  = 0*2975  per  cent,  of  ammonia. 
C.  Analysis  of  the  Soils.  * 
I. — Labelled  “Sandy  sterile  soil,  before  warping.” 
Specific  gravity  at  56°  Fahren.  with  interstices  . . 1*4003 
True  specific  gravity  . . . . . 2*4199 
Composition  per  cent,  of  the  soil  after  it  had  been  exposed  to  the  air 
for  several  weeks  at  60°  Fahren. 
Water 
Sand,  coarse  and  red 
Stones  (small) 2*040 
Undecomposed  vegetable  fibre,  little  or  none. 
( I norganic  substances 
1*060 
93*994  (Siliceous  granules 
| Organic  matter 
Fine  earth  (dried  at  300°  Fahren.)  2*892 
Soluble  saline  matters  . . . 0*014 
(Organic  matter 
93*106 
0*888 
1*579 
1*313 
100*000 
Water 1*0600 
Pure  sand 
93*1060 
Stones  .... 
2*0400 
Organic  matters,  insoluble  in  water  and  alkalis 
0*5934 
Humine  and  humic  acid 
, , 
1*1500 
• 2*2000 
Apocrenic  acid 
0*1428 
Crenic  acid  . 
# 
0*3138 
Chloride  of  calcium 
. # 
0*0003 
Salt, 
soluble 
Chloride  of  sodium 
, , 
0*0055 
Chloride  of  potassium 
, 
0*0014 
► in 
Sulphate  of  magnesia 
» • 
traces 
water, 
Sulphate  of  soda  . 
. # 
0*0069. 
0-0141 
Carbonates  of  lime  and  magnesia 
traces  only 
Lime  .... 
0 
0*0007 
Magnesia  and  alkalis 
, , 
minute  traces 
Oxide  of  iron 
• • 
0*2771 
Alumina 
# # 
0*3899 
Sulphate  of  lime  . 
, 
traces 
Perphosphate  of  iron 
• 
0*0001 
Oxide  of  manganese 
• 
traces 
Silicic  acid  . 
# # 
0*1399 
Undecomposed  silicates,  and  very  fine  insoluble 
silica,  &c.  ...... 
* 0*7722 
100*0000 
100  grains  of  the  soil  contained  of  nitrogen  0*0715  grains, 
= 0*0868  grains  of  ammonia. 
* I should  observe  that  in  each  of  the  three  following  analyses  the  fine  earth  from 
eight  or  ten  thousand  grains  of  the  soils  was  employed. 
