Practical instruction in hypnotism and suggestion (1903)
Flint, Herbert L. (Herbert Longley), b. 1862 · Chicago, Flint & Flint · leaf 18
this is the lowest that the human ear rec-ognizes. It is claimed that there are noises lowerin vibration than this. Whales, for instance, com-municate with each other at a distance of two orthree miles, so it is thought that they utter a notewhich they can hear but which is too low for thehuman… … Mcricftl^sTRUcnoNHYPNOTISM AND 5VGGESTI02S HEKBERlkFLIOT.
Hypnotism
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