214 EXPLANATORY INTRODUCTION m 
vegetative and reproductive organs, its economic products, and finally, 
in the case of the more important orders, its classification into sub-orders 
and tribes, with the more important genera belonging to each. The 
student should work through this part and study as many of the genera 
as possible before leaving the order. This is easily managed in dealing 
with the outdoor collections in our botanic gardens. 
No particular attempt is made in this part of the book to avoid 
technical terms. When a term or abbreviation is used that the reader 
does not understand he should refer to the Index, where an explanation 
will be found or a reference made to Part I, in which the terms used are 
explained. 
GENERAL WORKS OF REFERENCE QUOTED. 
The following are the chief sources used in the compilation of Part II ; 
they are quoted by abbreviated titles. Most of the abbreviations are 
obvious; a few of the least obvious are given in brackets below, as well 
as in the General Index. 
Bentham and Hooker, Genera PI ant arum : London. 
Campbell. D. H., Mosses and Ferns: London. 
Darwin, Origin of Species, Naturalist's Voyage , and other works. 
De Bary, Comparative Anatomy of the Phanerogams and Ferns , Engl, 
ed., Oxford. 
De Candolle, Origin of Cultivated Plants , Engl. ed. 
Drude, Pflanzengeographie : Leipzig. 
Durand, Index Generum Phaneragamarum. 
Eichler, Bliithendiagramme : Leipzig. 
Engler, Das Pflanzenreich (Pf. R. ) : Leipzig (in course of publication) ; 
Syllabus der Vorlesungen. 
Engler and Prantl, Die Natiirlichen Pflanzenfamilien (Nat. PfL ) : 
Leipzig. 
Goebel, Entwicklungsgeschichte der Pflanzenorgane , in Schenk’s Hand- 
buch; Organography of Plants , Engl, ed.; Pflanzenbiologische 
Schilderungen . 
Gray, Asa, Structural Botany: London. 
Hooker, J. D., Himalayan Journals. 
,, ,, and Jackson, Index Kewensis , and the Supplement by 
Durand and Jackson. 
Hooker, W. J., Synopsis Filicum. 
Jackson, Dictionary of Botanical Terms. 
Kerner and Oliver, Natural History of Plants, Engl. ed. 
Knuth, Handbuch der Bliitenbiologie . 
Ludwig, Biologie der Pflanzen. 
Muller, H., Fertilisation of Flowers, Engl. ed. : London 1883; Alpen- 
blumen: Leipzig, 1881. 
