That is the "detailed" instruction for the third round of the Priscilla's hanky:
"Like 2d row, except that the insertion is put outside the row of wheels."
That 3rd row is tatted outside the row of wheels, while the 2nd was entirely inside. The instructions for the 2nd row were a sort of joke, so I puzzled over it a little before finding a solution for the 3rd.
We tatters of the third millennium, we have the power of technology, phones with camera and great apps! I folded what I'd already done in half, then took a shot:
Then, here I am, at this point:
That is at page 12 of Priscilla Tatting Book #1 (1909), picture 30.