Alfred Russel Wallace,
Popular Science Monthly
(1909)
“ It is only by continually keeping in our minds all the facts of nature which I have endeavored, however imperfectly to set before you, that we can possibly realize and comprehend the great problems presented by the "World of Life"—its persistence in ever-changing but unchecked development throughout the geological ages, the exact adaptations of every species to its actual environment both inorganic and organic, and the exquisite forms of beauty and harmony in flower and fruit, in mammal and bird, in mollusc and in the infinitude of the insect-tribes ”
