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The Structure And Use Of The Vocal Organs, And The Means Of Securing Distinct Articulation.

	THE ARTICULATORY APPARATUS.                       31
	farther back for SH or ZH. The movement of the tongue modifies the sounds of the vowels and an in­finite variety of vowel sounds can be thereby produced.
	Fig. 17.—Muscles of the Tongue and Larynx (outside).
	Vowels are classified by phoneticians, according to the part of the tongue moved in their production, into front