Wings of struthious birds show retrograde development, [437]

Winter temperature of Europe and America, [196]

Wolf, range of, [14]

Wollaston, Mr. T. V., on insular character of St. Helena, [294]

on St. Helena shells and insects, [297]

Wood, Mr. Searles V., jun., on formation of "till," [114]

on alternations of climate, [118]

on causes of glacial epochs, [125]

conclusive objection to the excentricity theory, [160]

on continuous warm Tertiary climates, [180]