some people are confused by this, but I find that this has helped a few people understand the mechanics of knit and purl stitches
WAY back in the past, they used to call purl stitches "reverse stitches" because they are the same as a knit stitch only reversed. So, the back of a purl stitch is a knit stitch and the back of a knit stitch is a purl stitch. Knitting is just a series of interlocking loops, it just depends on if the stitch is pulled through the front or the back of a loop to make a bump(purl) or a V(knit).
When it says to work stitches as they appear, you just work in stockinette for that particular collumn of stitches (knit the V's and purl the bumps)
I hope that made it clear.
some people hear that and just go "OOOOH"
and others look at my like i'm crazy