letters at my disposal. I cannot sufficiently express my thanks to Mr. Francis Darwin for generously allowing me to print portions of the correspondence which for seven or eight years was one of the chief pleasures and privileges of my husband's life. I must also thank my brother and sister-in-law, the Dean of Christ Church, Professor Poulton, Professor Schäfer, Professor Le Conte, Mr. Thiselton-Dyer, and others for like permission.

And I must express my most sincere gratitude to the Rev. P. N. Waggett, to Professor C. Lloyd Morgan, and to my cousin Mrs. St. George Reid (late of Newnham College, Cambridge), for their constant help and advice.

To Mrs. Reid I owe more than I can well express. Her scientific knowledge and ability have been simply invaluable, and have been used with ever-ready and ungrudging generosity and kindness.

There are other aspects of my husband's life which are interesting, but again I think he has told his own story, and it is needless for me here to speak of what, to some extent, he has laid bare—of mental perplexity and of steadfast endurance and loyalty to Truth. It may be that others, wandering in the twilight of this 'dimly lighted world,' may be stimulated and encouraged and helped to go on in patience until on them also dawns that Light. If this be so it will not be altogether in vain that he bore long years of very real and very heavy sorrow.

E. R.

Oxford: 1895.

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