[8] Vol. II, Chap. 19.
[9] Chapter 9.
[10] If, as Haekel says in “The Riddle of the Universe,” p. 116, “When the mimosa roots are shaken by the tread of a passerby, the stimulus is immediately conveyed to all the cells of the plant,” may not the far stronger stimulus of musical sound be similarly transmitted to the human cells not directly concerned in hearing?
[11] The octave of half-tones sung by the Hylobates Syndactylus is merely an effort at speech.
[12] American History and Encyclopedia of Music.
[13] Ibid.
[14] Ibid.
[15] It will be noted that the reference to ideas as “disturbances of purely physical, molecular rhythm” is used throughout this book, for it is here claimed that just as the unconscious cessation of breathing for a few seconds during the writing of an idea, expresses the check of mental action upon heart action and the circulation of the blood, so also does the continual reception of new impressions into the mind, affect the original regular rhythmic movement of the entire body. Hence thought is a real disturber of rhythm within the body. Similarly, any burst of anger, fear, or joy is immediately registered in the pulse.
[16] We are aware that Darwin stresses the element of sexual selection in the bird’s song.