EXERCISES
To cantus firmus a write the fourth species in one part, as usual.
To cantus firmus b write first, second and fourth species in the other three parts. [[Fig. 143a].]
To cantus firmus c write the first, third and fourth species in the other three parts. [[Fig. 143b].]
To cantus firmus c write fourth species mixed in the other parts. [[Fig. 143c].]