days, beginning towards the end of December, and only when rain seems
imminent or has just fallen.

When manure is broadcast over a young clover field, and presently after
washed in by rain, the effect is identical with that of first dissolving
it in water, and then distributing the dilution over the surface, with
this difference, namely, that the first plan costs only the price of the
guano, &c, and is available at any time and to every one, whereas the
latter implies the construction of tanks and costly machinery.

_T. incarnatum_, crimson or Italian clover, though not hardy enough to
withstand the climate of Scotland in ordinary winters, is a most
valuable forage crop in England. It is sown as quickly as possible after
the removal of a grain crop at the rate of 18 lb to 20 lb per acre. It
is found to succeed better when only the surface of the soil is stirred
by the scarifier and harrow than when a ploughing is given. It grows
rapidly in spring, and yields an abundant crop of green food, peculiarly
palatable to live stock. It is also suitable for making into hay. Only
one cutting, however, can be obtained, as it does not shoot again after
being mown.

_T. repens_, white or Dutch clover, is a perennial abundant in meadows
and good pastures. The flowers are white or pinkish, becoming brown and
deflexed as the corolla fades. _T. hybridum_, Alsike or Swedish clover,
is a perennial which was introduced early in the 19th century and has
now become naturalized in Britain. The flowers are white or rosy, and
resemble those of the last species. _T. medium_, meadow or zigzag
clover, a perennial with straggling flexuous stems and rose-purple
flowers, is of little agricultural value. Other British species are: _T.
arvense_, hare's-foot trefoil, found in fields and dry pastures, a soft
hairy plant with minute white or pale pink flowers and feathery sepals;
_T. fragiferum_, strawberry clover, with densely-flowered, globose,
rose-purple heads and swollen calyxes; _T. procumbens_, hop trefoil, on
dry pastures and roadsides, the heads of pale yellow flowers suggesting
miniature hops; and the somewhat similar T. minus, common in pastures
and roadsides, with smaller heads and small yellow flowers turning dark
brown. The last named is the true shamrock. Specimens of shamrock and
other clovers are not infrequently found with four leaflets, and, like
other rarities, are considered lucky. Calvary clover is a member of the
closely allied