To cantus firmus _b_ write fourth species in one part in triple rhythm.
Write three settings, as above.

To cantus firmus _b_ write second species in one part and third in the
other. [Fig. 122.]

[Illustration: Fig. 122.]


CANTI FIRMI

[Illustration: Fig. 123.]




LESSON XVIII

FOURTH SPECIES (Continued)

EXERCISES


Write two eight-measure phrases, using the fourth species mixed in all
parts. [Fig. 124_a_.]

To cantus firmus _a_ write second species in one part and fourth in the
other. [Fig. 124_b_.]