mmonia?" Before we attempt to answer the
question, let us look at the next year's experiments.--The following
is the results of the experiments the _seventh_ year, 1849-50.

Experiments at Rothamsted on the Growth of Wheat, Year After Year,
on the Same Land.

Table VII.--Manures and Produce; 7th Season, 1849-50. After the
Harvest of 1849 the Field Was Tile-Drained in Every Alternate Furrow,
2 to 3 Feet Deep. Manures and Seed (Red Cluster), Sown Autumn, 1849.

Manures
FM Farm-yard Manure.
P-A Pearl-ash.
S-A Soda-ash.
SMg Sulphate of Magnesia.
B-A Bone-ash.
SAc Sulphuric Acid. (Sp. gr. 1.7)
MAc Muriatic Acid.
SAm Sulphate of Ammonia.
MAm Muriate of Ammonia.
RC Rape-cake.

----+----------------------------------------------------------+
| |
| Manures per Acre. |
P +-----+-----+-----+-----+-----------------+-----+-----+----+
l | | | | | Superphosphate | | | |
o | | | | | of Lime. | | | |
t | | | | +-----+-----+-----+ | | |
s | FM | P-A | S-A | SMg | B-A | SAc | MAc | SAm | MAm | RC |
----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----+
|Tons.|lbs. |lbs. |lbs. |lbs. |lbs. |lbs. |lbs. |lbs. |lbs.|
0 | .. | .. | .. | .. | 600 | 450 | .. | .. | .. | .. |
1 | .. | 600 | 400 | 200 | .. | .. | .. | .. | .. | .. |
2 | 14 | .. | .. | .. | .. | .. | .. | .. | .. | .. |
3 |Unmanured. | .. | .. | .. | .. | .. | .. | .. | .. |
| | | | | | | | | | |
4 | .. | .. | .. | .. | 200 | .. | 200 | 300 | .. | .. |
| | | | | | | | | | |
5a | .. | 300 | 200 | 100 | 200 | 150 | .. | 250 | 250 | .. |
5b | .. | 300 | 200 | 100 | 200 | 150 | .. | 250 | 250 | .. |
6a | .. | 300 | 200 | 100 | 200 | 150 | .. | 200 | 200 | .. |
6b | .. | *00 | 200 | 100 | 200 | 150 | .. | 200 | 200 | .. |
7a | .. | 300 | 200 | 100 | 200 | 150 | .. | 200 | 200 | 500|
7b | .. | 300 | 200 | 100 | 200 | 150 | .. | 200 | 200 | 500|
| | | | | | | | | | |
8a | .. | .. | .. | .. | .. | .. | .. | 200 | 200 | .. |
8b | .. | .. | .. | .. | .. | .. | .. | 200 | 200 |