Maybe a mistake to bring in tuning to thoughts on harmony -- except that they are intimately related -- -- reminds me of Tristram Shandy's Uncle Toby's hobby horse -- -- -- if you haven't read Tristam Shandy yet, you should drop that harmony book and read it first -- -- -- which applies here not only to style but also to substance -- -- and that relation requires a little explanation -- so here is why the second quote is marvelous (and wrong in substance) to me :
In the key of C, there are two tunings for C, the tonic: one at 0 cents and one 22 cents flat;
there are two tunings of C sharp: 8 cents and 30 cents flatter than 100 cents above tonic;
there are two tunings of D natural: the pythagorean, 4 cents sharp and the lowered supertonic, 14 cents flatter than 200 cents above tonic.
From C to C# is either 92, or 70, or 114 cents, depending on context.
From C# to D is either 112, or 90, or 134 cents, depending on context.
In the key of C, there are two tunings for C, the tonic: one at 0 cents and one 22 cents flat;
there are two tunings of C sharp: 8 cents and 30 cents flatter than 100 cents above tonic;
there are two tunings of D natural: the pythagorean, 4 cents sharp and the lowered supertonic, 14 cents flatter than 200 cents above tonic.
From C to C# is either 92, or 70, or 114 cents, depending on context.
From C# to D is either 112, or 90, or 134 cents, depending on context.