CHOICE PLANTS FOR ROCK GARDENS 169 
considerable variation in shade and purity of colour must 
be looked for in seedlings. A specially good form may 
be propagated by taking young growths from the crown 
when about 2} inches long, rooting them in a close frame, 
using compost that is about half of sand. When planted 
on the rockery care should be taken to provide plenty of 
depth for the fleshy roots, but the genus is specially 
suitable for the raised alpine seed. 
PoLtyGALa.—Of dwarf, shrubby character, and neat and 
compact habit, Polygala chamebuxus and its variety 
purpurea is not only a pretty evergreen with box-like 
foliage, but is practically an ever-blooming plant. Its 
blossoms are pea-shaped, borne in between the foliage, 
thus being well protected during bad weather, and when 
a plant is well established in sandy soil of a leafy or peaty 
nature, free from lime, it will be very rare, whether the 
month be January, June, or December, for one to look in 
vain for blossoms. In the type, the flowers are yellow 
blotched with purple, but in the form purpurea the purple 
predominates, the tips alone being yellow. By earthing 
up a plant with sandy peat, roots will be formed up the 
stems, enabling a clump to be divided and successfully 
transplanted. 
PRIMULA.—The primroses of Europe would provide 
ample material to fill the whole of this book, and when, 
in addition, we begin to think about the delightful species 
that have been introduced from China and Japan, and of 
the glorious hybrids that have been produced by crossing 
some of these with European species, we despair of con- 
densing into the limited space that can be spared for any 
