Then, instead of the Second Subordinate theme, a _Development_ (106-138); followed by an elaborate _Re-transition_ (139-166), and a regular _Recapitulation_.

Two wholly independent coda-sections are added, an _Adagio_ (derived from the third movement of the sonata) and a _Presto_, based upon the Principal theme.
The sonata-allegro with new Middle theme is illustrated in Beethoven, pianoforte sonata, op.

14, No.

1, first movement; the middle Division contains a preliminary allusion to the Principal theme, but is otherwise an entirely new thematic member, very suggestive of the "Second Subordinate theme" of the Rondos (17-measures long,--up to the Re-transition, in which, again, the Principal theme is utilized).
LESSON 18 .-- Analyze the following examples of Irregular form.

They are classified, as in the text:-- 1.