Wells, W. C, and Natural Selection, 18 White, G., 3 Williams, C. M., 217 Wilson, E. B., on cytology, 99 Wolf, 249 Wollaston's, T. V., _Variation of Species_, Foot Note 59 Woltmann, 277 Woolner, 118 Wundt, on language, 207, 208 _Xylina vetusta_, 82 Yucca, fertilisation of, 78, 79 Zeller, E., Foot Note 3 _Zoonomia_, Erasmus Darwin's, 7 * * * * * _The publishers will be pleased to send, upon request, an illustrated catalogue setting forth the purposes and ideals of The Modern Library, and describing in detail each volume in the series. Every reader of books will find titles he has been looking for, attractively printed, and at an unusually low price._ * * * * * End of the Project Gutenberg EBook of Evolution in Modern Thought, by Ernst Haeckel and J. Arthur Thomson and August Weismann