And there are passages in the extracts given from his letters written to Miss Emily Sellwood, during the long engagement that preceded their marriage, which indicate the bent of his mind toward philosophic quietism, with frequent signs of that half-veiled fellow-feeling with natural things, that sense of life in all sound and motion, whereby poetry is drawn upward, by degrees and almost unconsciously, into the region of the "Higher Pantheism." Nor has any English poet availed himself more skilfully of a language that is peculiarly rich in metaphors, consisting of words which still so far retain their original meaning as to suggest a picture while they convey a thought. It is partly due to these qualities of mind and style that no chapter in this book, which mingles grave with gay very attractively, contains matter of higher biographical interest than that which is headed "In Memoriam." For it is in this noble poem, on the whole Tennyson's masterpiece, that he is stirred by his own passionate grief to dwell on the contrast between irremediable human suffering and the calm aspect of Nature, between the short and sorrowful days of man and the long procession of ages. From the doubts and perplexities, the tendency to lose heart, engendered by a sense of forces that are unceasing and relentless, he finds his ultimate escape in the spirit of trust in the Powers invisible, and in the persuasion that God and Nature cannot be at strife. In a letter contributed to this _Memoir_ Professor Henry Sidgwick has described the impression produced on him and others of his time by this poem, showing how it struck in, so to speak, upon their religious debates at a moment of conflicting tendencies and great uncertainty of direction, giving intensity of expression to the dominant feeling, and wider range to the prevailing thought: