Report of Experiments on tlie 
allotted to eacli experiment was so extremely small, tlie results 
must by no means be taken as absolutely correct. They can, 
indeed, be only looked upon as rough approximations ; but, as 
such, they may be trusted as indicating the large amount of pro- 
duce of Clover that has been taken from this garden soil, and as 
affording some idea of the relative amount of produce under the 
three different conditions of manuring. 
The estimated total amount of green Clover obtained in six 
years from this garden soil, without further manure, is nearly 
126 tons per acre — equal to about 26^ tons of hay, or to an 
average of nearly 4^ tons of Clover-hay, per acre, per annum. 
The produce was considerably increased by the application of 
gypsum, and still more so by that of the sulphates of potash, 
soda, and magnesia, and superphosphate of lime. In four years, 
the increase by the use of gypsum amounted to about 15^ tons 
of green Clover, or about 3i tons of hay — nearly 1 ton of hay 
per acre per annum. The increase in the four years, by the use 
of the alkalies and phosphate, is estimated to amount to 28|^ 
tons of green produce, or rather more than 6|- tons of hay — 
equal to nearly If tons increase of hay per acre per annum. 
It is worthy of remark, that it was in some of the very same 
seasons in which these heavy crops of Clover were obtained from 
the garden-soil, even though grown year after year, and without 
fresh seed, that we entirely failed to get anything like a moderate 
crop of Clover in the experimental field, only a few hundred yards 
distant. The failure in the latter case would, therefore, appear 
to be connected with the conditions of soil in relation to the 
plant, rather than to those of the atmospjliere. 
We now come to another and not very satisfactory part, of our 
task ; namely, that of endeavouring to seek, among the various 
causes of Clover-failure which have been suggested, for some 
explanation of the signal failure of the crop in our experimental 
field. 
The comparison of the results in the garden with those in the 
field, seems to lead to the exclusion of some of the reasons enu- 
merated in the early part of our Paper, as having been brought 
forward to account for the Clover failure. It may be well, how- 
ever, to make a few passing remarks on some of them. 
With regard to the attacks of Insects : — Those who have ex- 
amined the plants on a field of Clover failing in the ordinary way, 
will probably sometimes have found a small insect in those plants 
which are beginning to show signs of dying off. It is generally 
found near the junction of the root and crown. Now, as ex- 
perience teaches us that the plant seldom suffers serious injury if a 
sufficient number of years has elapsed since Clover was grown 
before. 
