Paragraph 156. The slip stitch, which interlocks other crochet stitches, is made by passing a hook through a completed loop and drawing the yarn through that loop before drawing it through the loop on the hook. The slip stitch in Figure 67 is made of yarn with a bone hook. First crochet a chain as long as desired, then go back over it, picking up each stitch and making a parallel line of chain stitches with all the stitches interlocked. To do this, hold the last loop of the chain stitch on the hook, insert the point of the hook through the next loop in the chain, and catching the yarn, as in Figure 67, draw it through the completed loop of the chain stitch and continue drawing it until it also passes through the loop which is on the hook. This forms a new loop on the hook; draw this loop tight and inserting the hook through the next completed stitch, repeat the process until you have made the number of stitches desired. The abbreviation for the slip stitch is sl. st.
This stitch is used in filet work, or any place where a solid crochet effect is desired and in fastening other crochet stitches in place.