There's already a purl round in it... Cast on, knit 1 round, knit 1 round with the increase in it, purl one round, then go into the lace pattern on chart M.1B. Or did you mean do more than one round?
I don't like doing ribbing so I do garter st at the bottom of my tops by doing a purl round after the cast on, knit 1 round, one more purl round, then go into the pattern. So you could certainly do the first round as a purl, knit the next one with the incs in it, then purl another one and start the lace pattern after that.