Fragment of Mendelssohn.] There is no cadence in the fourth measure,--the current of the melody obliterates it and hurries on, voicing the last measure again and again until it dies away in the tenth measure, where a cadence ends it.

That it should be the _tenth_ measure is purely accidental; the number of measures is of little account in the act of extension; here, it was continued until a convenient place was found (with reference to chord and key) for the cadence.

Further:-- [Illustration: Example 41.

Fragment of Mendelssohn.] Measures 1, 2, 3 and 8 constitute the original regular four-measure phrase.
The following regular phrase (to be found in the last movement of Beethoven's pianoforte sonata, op.

28):-- [Illustration: Example 42.