- Will really exerts force, 367; probably the primary source of force, 368.
- Wood, Mr. T. W., on orange-tip butterfly, 59.
- Woodcocks and Snipes, protective colouring of, 53.
- Woodpeckers, why scarce in England, 32.
- XANTHIA, autumnal colours of these moths, 62.
- ZEBRAS, 299.
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