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48 Conversation below water is carried on either by touch when the conversers are close enough together, or by sight or sound when they are at a distance.

In the former case, the speaker applies his forefinger to any part of the body of the person he is speaking to, and, by a rapid succession of gentle taps and strokes, conveys to him a sensible perception of what he wishes to say. While accompanying my Instructor, he was frequently accosted by persons whose business or pleasure brought them to where we were, and I was astonished at the rapidity and animation with which they seemed to converse by means of the tactile language I have attempted to describe.

When they wished to converse without coming in contact they took from their pockets two thimble-like instruments which they placed on their thumb and middle finger, and, by knocking them together, would produce a clicking noise, which could be distinctly heard at a considerable distance, and which conveyed what they wanted to say by means of slight and louder, rapid or more prolonged taps and pauses, perfectly comprehensible to those familiar with the language.

Or they would converse with equal facility by merely moving their fore-finger hither and thither with a rapidity the unaccustomed eye could scarcely follow, but which was equally efficacious in conveying a meaning to the initiated. As with our deaf and dumb people the conversation was much aided by shrugs, nods, and conventional signs which conveyed a great deal of meaning without the necessity for spelling out each word.

By diligent study of the elementary books I found in the Instructor's house, I soon acquired tolerable