I. _On the Phenomena of Variation and Geographical Distribution as illustrated by the_ Papilionidæ _of the Malayan Region. By_ ALFRED R. WALLACE, _Esq._ When the naturalist studies the habits, the structure, or the affinities of animals, it matters little to which group he especially devotes himself; all alike offer him endless materials for observation and research. But, for the purpose of investigating the phenomena of geographical distribution and of local or general variation, the several groups differ greatly in their value and importance. Some have too limited a range, others are not sufficiently varied in specific forms, while, what is of most importance, many groups have not receive…
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