PREFACE v. 
where, or call attention to points requiring elucidation. They might easily 
have been extended, but for the fear that the work might outgrow the limits 
assigned. 
ADDENDA.—The Addenda has outgrown its intended limits, because the 
work has taken so much longer to complete than was anticipated. Roughly 
speaking, it may be said to contain three years additions, up to the end of 
1907. As the plan is uniform throughout, it is only necessary to add that 
the numbers indicate the position in the body of the work. Numbers 
followed by letters, a, b,c. &c., indicate actual additions, but the remainder 
indicate additional information respecting names previously enumerated. 
It is intended to give later and future additions in the Orchid Review, so as 
to prevent the work from falling out of date. Particulars of this appear on 
page 326, after the Index. 
INDEx.—As the adopted names of the hybrids, as well as those of their 
parents, follow a strict alphabetical sequence, it has been thought necessary 
to give only an Index of Synonyms. The Addenda, however, of both 
Parts I. and II. should not be overlooked by those who consult the work. 
Finally appears a List oF ILLUSTRATIONS, 120 in number. 
Omissions.—A few remarks under this head appear necessary. The 
absence of many hybrids of unknown or doubtful parentage has already been 
explained as unavoidable, but the omission of many well-known natural 
hybrids, as Odontoglossum X Andersonianum and Léeliocattleya x 
elegans, may occasion surprise, especially as they appear in the list of 
parents. But a careful examination of the programme will show that, 
strictly speaking, natural hybrids do not come within the limits of the work, 
and can only be included when they have been raised artificially. They 
are more numerous than is generally realised, and their inclusion would 
have greatly extended the bulk and difficulty of the work. Many are also 
not in cultivation. It was necessary to draw the line somewhere, and it 
may yet be possible to deal with them elsewhere. The inclusion of the multi- 
tudinous named varieties was impossible, and a selection would have been 
both difficult and unsatisfactory, but we have been able to indicate those 
that have been figured, by the inclusion of the varietal name within brackets 
after the figure cited. The only other matter which occurs to us is the 
omission of Awards. They had been included, but it was found that there 
was such an utter want of uniformity between the systems of the different 
Societies, and the value of their awards at different periods, that the record 
was not worth the space required, and they were again cancelled. The 
records of the different Societies must be consulted for them. 
SECONDARY AND MORE COMPLEX HyBRIDS.—A great deal of difficulty 
has been experienced in dealing with secondary hybrids and those of more 
complex parentage. Although we have treated them the same as primary 
