In order for a round tissue is rather flat without waves and without shrinkage, should be increased in all rows.
After crocheting the ring, you must work 8 stitches and in the 2nd row start with the increases, one at each point. In the 3rd row should be work 1 stitch and the next stitch do the increased, weaving 2 stitches in the same place. In the 4th row should be work 2 stitches and make the following stitch weave 2 stitches in the same place.
These increases are repeated until the desired diameter as shown in the graph.
IMPORTANT: This applies when crocheting in any of the basic stitches..