both
Mamillaria and Echinocactus are successfully managed in the
neighbourhood of that town.

Cultivation.--Particulars with respect to cultivation are given along
with the descriptions of most of the species, but a few general
principles may here be noted. With only a few exceptions, all the
cultivated Mamillarias may be grown in a warm, sunny greenhouse, or they
may be placed in a frame with a south aspect, during our summer,
removing them into artificially heated quarters for the winter. They do
not like a large body of soil about their roots, but always thrive best
when in comparatively small pots. If a sweet, new, fibry loam, mixed
with broken bricks or cinders, be used to pot these plants in, they may
then be left undisturbed at the root for several years. Much harm is
often done to the more delicate kinds of Cactuses by repotting them
annually; the best-managed collection I have seen had not been repotted
for four years. This would not be safe if a poor and exhausted soil were
used in the first instance. The pots should be well drained with crocks,
and these covered with a layer of fibre sifted from loam. In summer, the
soil should be kept moist, but never saturated; and after a bright warm
day, the stems may be moistened over by syringing them with tepid water.
A point of much importance in connection with these, and indeed all
tropical and extra-tropical plants, is, that the water used for watering
or syringing them should be rain-water if possible, and never more than
a degree or so colder than the plants themselves would be. Thus, a plant
which had been standing in the full glare of a midsummer sun all day,
would be much endangered by watering it with cold tap-water. Where
proper arrangements for water are not made in a greenhouse or stove, it
is a good plan to place the water wanted for the day's use in the sun
along with the plants. A little bag filled with soot and tightly tied at
the neck, and water, is a good method for rendering hard tap-water
suitable for watering the roots of plants. In winter, Mamillarias may be
kept quite dry at the roots, except in mild sunny weather, when a little
water may be given.

A collection of the most distinct kinds may be successfully managed in a
glass case in a room window, providing the sun shines through it for a
few hours in the day.

Propagation.--This is usually effected by means of seeds, which may be
procured from Continental seedsmen as well as from our own.