I have the 1997 edition of Lew Berryman's Intonation Plus. In mine, Exercise 1 and Exercise 4 on page 63 differ only in articulation.
In Exercise 1 he says he wants you to bow it staccato (He misspelled it). But what he shows in the notation is really portato, i.e., staccato within a slur. (There's a dot above or below each note head.) This is sometimes called "articulated legato." But I'm wondering if perhaps he just used a slur marking to mean he wants you to play it in one bow; he actually says he wants you to do that in his explanatory notes.
In Exercise 4, he says he wants you to bow it appoggiato (He misspelled that one, too.) within the slur. (There's a short horizontal line above or below each note head.) Again, in his notes he says he wants you to play it in one bow.
The explanatory notes are immediately under the exercises. Maybe they got left out of your edition. If you want, I'll quote them to you exactly--misspellings and all--so you can paste them in.
edit: I haven't found anything regarding a second part or volume to Intonation Plus.