I've been studying said book for learning melody writing and I find it to be very methodical. It is completely free to download for anyone interested (google).
I found a line I can't seem to understand. On page 18, par. 30:
"The leap of an octave is allowed from any tone, upward or downward (according to the low or high pitch of the tone from which the leap is to be made). This is simply a wider version of par. 9a" (my understanding of par. 9a is basically that a tone is allowed to be repeated once or more, where-ever, whenever including active tones (or tendency tones) like 4 and 7).
However assuming I haven't made any wide leaps recently, does this mean I can leap an octave whenever? For example in C major, can I write a melody like: C, B, (leap an octave down) B, C? That doesn't seem right to me and that seems inconsistent with what the book has taught up until that point. My understanding of the book is that for example since 7 is exerting a lot of pressure on the melody upward to reach 1, leaping in the opposite direction should be a big no-no.
I'm not asking what makes sense musically, rather understanding the rules the book lays out. Thank you.