ixed, and no doubt it will be modified considerably during the
next few years, as more horticulturists try to apply the Code to the
groups in which they are interested.

In order to understand the alternatives available, it will be helpful, I
think, to consider first the _third part_ of the full name, as the use
of this, and of the second part, are very closely connected. The third
part, as I have said, is a cultivar-name of a particular form of the
hybrid concerned, and, in the first place, it is extremely important to
realize that _every cultivated hybrid that is considered worth naming at
all should receive a cultivar-name from the outset of its "career,"
even_ _if, at the time, only one form is known, or is considered worth
naming._ To take an actual example, at the time when the new hybrid
_Viburnum_ x _bodnantense_ was described in the _Botanical Magazine_,
only one form, or clone, of it had been "put into circulation," and yet
that single clone was given a cultivar-name, 'Dawn.' The object of doing
this was to be able, in the future, to refer by name to this particular
clone and so avoid confusion with any later, and possibly inferior,
forms of the same cross that might be produced. In the absence of the
name 'Dawn,' less desirable clones could legitimately be passed off
under the collective name _V_. x _bodnantense_ without the acquirer
realising that he was not getting the original and superior form.

Bearing in mind, then, the principle that _all_ cultivated hybrids
should have a third part, cultivar-name, we can turn again to the use of
the various possible designations for the second part listed above. The
choice of designations depends, broadly speaking, on _convenience_, that
is to say, on what, in practice, will be found the most useful method of
referring to the plants concerned. In principle, of course, every hybrid
whose parentage is known has an appropriate formula-designation, and in
certain cases such a formula would be sufficient as a second part
designation without inventing either a Latin name or a vernacular
collective name. For instance, when there are only a very few forms of a
particular cross, it might not be considered necessary to be able to
refer to the forms collectively, and a second part name would not then
be given. For example, _Rubus_ 'Merton Thornless,' when raised, was the
only form of the hybrid _R. rusticanus inermis_ x _thyrsiger_ to be put
into circulation, and it was not give