7 7
| |------+------+----+------+------+------+---------
30 |Potatoes | 0.55 |12.32 |0.04| 0.32 |12.28 | 2 7 | 0 6 5
31 |Carrots | 0.28 | 6.27 |0.03| 0.48 | 6.24 | 1 4 | 0 4 3
32 |Parsnips | 0.36 | 8.06 |0.03| 0.37 | 8.03 | 1 8 | 0 5 5
33 |Swedish turnips| 0.22 | 4.93 |0.02| 0.41 | 4.91 | 1 0 | 0 4 7
34 |Mangel-wurzels | 0.40 | 8.90 |0.03| 0.34 | 8.93 | 1 10 | 0 5 0
35 |Yellow turnips |(0.22)|(4.93)|0.02|(0.34)|(4.91)|(1 0)|(0 3 11)
36 |White turnips | 0.30 | 6.72 |0.02| 0.30 | 6.70 | 1 5 | 0 4 0
---+---------------+------+------+----+------+------+------+---------

CHAPTER XXVI

THE ROTHAMSTED EXPERIMENTS.

Reference has been so repeatedly made in the preceding pages to the
Rothamsted experiments on manures, that it may form a fitting conclusion
to the present treatise to give a short account of these famous
experiments.

In describing these experiments, the author has remarked elsewhere[256]
"that, in respect of their wide scope, dealing as they have done with
almost every department of farming, the elaborate care and accuracy with
which they have been carried out, the length of time they have been in
progress, and, lastly, in respect of the important bearing their results
have had on agricultural practice, these famous experiments may be
justly described as unrivalled by any other similar ones."

Started on a small scale in 1837 by Sir John (then Mr) Lawes, they were
placed on a systematic basis in 1843, in which year Sir John Lawes
associated with himself Sir (then Dr) J. Henry Gilbert. They have thus
been in progress for a period of fifty years--a fact which was
celebrated a few months ago by the presentation of numerous
congratulatory addresses from various learned and agricultural societies
to the distinguished investigators, and the erection of a memorial
granite slab at Rothamsted. What increases the feeling of gratitude due
to Sir John Lawes by the agricultural community, is the fact that the
entire expense of conducting these experiments has been borne by
himself, and he has further most generously handed over to the nation a
large sum of money and a certain area of land for carrying them on in
perpetuity.

_Nature of Experiments on Crops and Manures._

The earliest systematic experiments were on turnips, and since then
almost every common crop has been experimented on. Table I. (p. 562) is
a list of the different experiments, with th