Is rhyme a necessary part of poetry? In my judgment, rhyme is a hindrance to expression. The rhymer is compelled to wander from his subject, to say more or less than he means, to introduce irrelevant matter that interferes continually with the dramatic action and is a perpetual obstruction to sincere utterance. All poems, of necessity, must be short. The highly and purely poetic is the sudden bursting into blossom of a great and tender thought. The planting of the seed, the growth, the bud and flower must be rapid. The spring must be quick and warm, the soil perfect, the sunshine and rain enough--everything should tend to hasten, nothing to delay. In poetry, as in wit, the crystallization must be sudden. The greatest poems are rhythmical. While rhyme is a hindrance, rhythm seems to be the comrade of the poetic. Rhythm has a natural foundation. Under emotion the blood rises and falls, the muscles contract and relax, and this action of the blood is as rhythmical as the rise and fall of the sea. In the highest form of expression the thought should be in harmony with this natural ebb and flow. The highest poetic truth is expressed in rhythmical form. I have sometimes thought that an idea selects its own words, chooses its own garments, and that when the thought has possession, absolutely, of the speaker or writer, he unconsciously allows the thought to clothe itself. The great poetry of the world keeps time with the winds and the waves. I do not mean by rhythm a recurring accent at accurately measured intervals. Perfect time is the death of music. There should always be room for eager haste and delicious delay, and whatever change there may be in the rhythm or time, the action itself should suggest perfect freedom. A word more about rhythm. I believe that certain feelings and passions---joy, grief, emulation, revenge, produce certain molecular movements in the brain--that every thought is accompanied by certain physical phenomena. Now, it may be that certain sounds, colors, and forms produce the same molecular action in the brain that accompanies certain feelings, and that these sounds, colors and forms produce first the molecular movements and these in their turn reproduce the feelings, emotions and states of mind capable of producing the same or like molecular movements. So that what we call heroic music produces the same molecular action in the brain--the same physical changes--that are produced by the real feeling of heroism; that the sounds we call plaintive produce the same molecular movement in the brain that grief, or the twilight of grief, actually produces. There may be a rhythmical molecular movement belonging to each state of mind, that accompanies each thought or passion, and it may be that music, or painting, or sculpture, produces the same state of mind or feeling that produces the music or painting or sculpture, by producing the same molecular movements.