a chronological record of his work would be a patchwork, from which it would be difficult to disentangle the history of any given subject.The Table of Contents will show how I have tried to avoid this result.It will be seen, for instance, that after Chapter VIII. a break occurs ; the story turns back from 1854 to 1831 in order that the Evolution- ary chapters which follow may tell a continuous story.In the same way the Botanical Work which occupied so much of my father's time during the latter part of his life is treated separately in Chapters XVI. and XVII.With regard to Chapter IV., in which I have attempted to give an account of my father's manner of working, I may be allowed to say that I acted as his assistant during the last eight years of his life, and had therefore an oppor- tunity of knowing something of his habits and methods.
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