With Photographic And Other Illustrations New York D. Appleton And Company 1899
Project Gutenberg EPUB3 edition
Darwin, Charles
N.B.—Several of the figures in these seven Heliotype Plates have been reproduced from photographs, instead of from the original negatives; and they are in consequence somewhat indistinct. Nevertheless they are faithful copies, and are much superior for my purpose to any drawing, however carefully executed.