must
be quick. Almost every professional grower of orchids is preparing to
enter the field. They, however, must needs give the most of their
attention to such crosses as may be confidently expected to catch the
public fancy, as has been said. I advise my readers to be daring, even
desperate. It is satisfactory to learn that Mr. Cookson intends to make
a study of bi-generic hybridization henceforward.[9]

The common motive for crossing orchids is that, of course, which urges
the florist in other realms of botany. He seeks to combine tints, forms,
varied peculiarities, in a new shape. Orchids lend themselves to
experiment with singular freedom, within certain limits, and their array
of colours seems to invite our interference. Taking species and genera
all round, yellow dominates, owing to its prevalence in the great family
of Oncidium; purples and mauves stand next by reason of their supremacy
among the Cattleyas. Green follows--if we admit the whole group of
Epidendrums--the great majority of which are not beautiful, however. Of
magenta, the rarest of natural hues, we have not a few instances.
Crimson, in a thousand shades, is frequent; pure white a little rare,
orange much rarer; scarlet very uncommon, and blue almost unknown,
though supremely lovely in the few instances that occur. Thus the
temptation to hybridize with the object of exchanging colours is
peculiarly strong.

It becomes yet stronger by reason of the delightful uncertainty which
attends one's efforts. So far as I have heard or read, no one has yet
been able to offer a suggestion of any law which decides the result of
combination. In a general way, both parents will be represented in the
offspring, but how, to what degree either will dominate, in what parts,
colours, or fashions a hybrid will show its mixed lineage, the
experienced refuse to conjecture, saving certain easy classes. After
choosing parents thoughtfully, with a clear perception of the aim in
view, one must "go it blind." Very often the precise effect desired
appears in due time; very often something unlooked for turns up; but
nearly always the result is beautiful, whether or no it serve the
operator's purpose. Besides effect, however, there is an utility in
hybridization which relates to culture. Thus, for example, the lovely
_Cypripedium Fairieanum_ is so difficult to grow that few dealers keep
it in their stock; by crossing it with _Cyp. barbatum_, from Mount
Ophir, a rough-and-ready co