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We begin the stitch at the left side of the canvas. Because this stitch does not leave much in the way of thread on the backside of the canvas, it is best to use an "away" knot.
The first step is a compensating stitch up and to the right over two canvas intersections (just like a tent stitch but over two intersections instead of one). The next step is to come forward with your needle in the hole that is two canvas threads to the left of where you just entered the canvas.
Now we begin the pattern. Go down and to the right over four canvas intersections. Return to the surface of the canvas two threads to the left of where you just finished (i.e., in the same row of holes, two threads to the left). Go up and to the right over four canvas intersections and enter the canvas. Return to the front side of the canvas two canvas threads to the left of where you just entered.
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The second row is worked in the same fashion as the first row (complete with away knot and compensating stitches). Make sure that the top stitches cross in the same direction and that the long stitches on the second row nestle underneath the long stitches of the first row.
A variation on the herringbone stitch is to use shorter stitches (slanted stitches over two canvas intersections and return stitches under one canvas thread). This variation would be better done on Penelope canvas as stitches under one thread tend not to be very stable.
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The herringbone stitch can be tedious to work but the results are spectacular.