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28 But it is vain for the Japanese poet to strive to adopt this counsel. With a language like the old Japanese it is only within the narrowest limits that it is possible to make the sound an echo to the sense. It is probably in some measure to the want of variety of rhythm which results from this quality that the preference of the national genius for short poems is due.

The mechanism of Japanese verse is simple in the extreme. Unlike Chinese, it has no rhyme, a want which is plainly owing to the nature of the Japanese syllable described above. As every syllable ends in a vowel, and as there are only five vowels, there could only be five rhymes, the constant reiteration of which would be intolerably monotonous.

In the Japanese poetical language all the vowels are of the same length, so that quantity, such as we find in the poetry of Greece and Rome, is unknown. Nor is there any regular succession of accented and unaccented syllables as in the poetry of modern Europe, the Japanese laying hardly any greater stress on one part of a word than on another. In short, the only thing in the mechanism of Japanese poetry which distinguishes it from prose is the alternation of phrases of five and seven syllables each. It is, in fact, a species of blank verse.

Some Japanese critics seem to think that the numbers five and seven were suggested by the Chinese Book of odes, where many of the poems consist of lines of five, and others of lines of seven syllables. This does not seem very probable.

The best known metre constructed on this principle is what is known as "Tanka" or "short poems." When poetry is spoken of in Japan it is usually this kind of