of
Climbing Plants" (1875), "Insectivorous Plants" (1876), "The Different
Forms of Flowers and Plants of the same Species" (1877), and "The Power
of Movement in Plants" (1880).

A different order, equally characteristic, is discovered in Wallace's
writings, and it is to be noted that while Darwin devoted himself
entirely to scientific subjects, Wallace diverged at intervals from
natural science to what may be termed the scientific consideration of
social conditions, in addition to his researches into spiritualistic
phenomena.

The many enticing interests arising out of the classifying of his birds
and insects led Wallace to the conclusion that it would be best to
postpone the writing of his book on the Malay Archipelago until he could
embody in it the more generally important results derived from the
detailed study of certain portions of his collections. Thus it was not
until seven years later (1869) that this complete sketch of his travels
"from the point of view of the philosophic naturalist" appeared.

Between 1862 and 1867 he wrote a number of articles which were published
in various journals and magazines, and he read some important papers
before the Linnean, Entomological, and other learned Societies. These
included several on physical and zoological geography; six on questions
of anthropology; and five or six dealing with special applications of
Natural Selection. As these papers "discussed matters of considerable
interest and novelty," such a summary of them may be given as will serve
to indicate their value to natural science.

The first of them, read before the Zoological Society in January, 1863,
gave some detailed information about his collection of birds brought
from Buru. In this he showed that the island was originally one of the
Moluccan group, as every bird found there which was not widely
distributed was either identical with or closely allied to Moluccan
species, while none had special affinities with Celebes. It was clear,
then, that this island formed the most westerly outlier of the Moluccan
group.

The next paper of importance, read before the same Society in November
(1863), was on the birds of the chain of islands extending from Lombok
to the great island of Timor. This included a list of 186 species of
birds, of which twenty-nine were altogether new. A special feature of
the paper was that it enabled him to mark out precisely the boundary
line between the Indian and Australian zoological