APPENDIX II 
AN endeavour has been made in this little handbook 
of the Common Natural Orders, to present as much of 
the natural history of each plant as space would allow. 
And the introductory section aims at giving a_ short 
summary of the main principles of the sections dealt 
with, though here again space has not allowed adequate 
treatment. But it is hoped this may be remedied by fuller 
treatment in the more extended work to which this may 
be regarded as in itself an introduction. 
In the meantime, the student who wishes to study the 
orders in still greater detail may be referred to the 
following works, which are selected as more suitable at 
this stage. 
The Natural History of Plants.—A. Kerner and Prof. 
F. W. Oliver. 
Flowering Plants and Ferns.—J. C. Willis. 
Elements of Botany.—F. Darwin. 
The Living Plant.—E. Step and A. E. Knight. 
Plant Biology.—Dr. F. Cavers. 
How to Study Wild Flowers.—Reyv. G. Henslow. 
Fertilisation of Flowers.—Hermann Muller. 
Flower Pollination.—P. Knuth. 
Cross- and Self-fertilisation.—C. Darwin. 
Fertilisation of Orchids.—C. Darwin. 
Forms of Flowers.—C. Darwin. 
Origin of Species.—C. Darwin. 
Darwinism.— A. R. Wallace. 
