This section is from the "Embroidery Stitches" book, by M. E. Wilkinson. Amazon: Embroidery Stitches.
Button Stitches. These are used in attaching plain or ornamental buttons. The stitches may be back-stitched in rings, as in (a), or crossed to form a star falling in the centre of the button, as in (b).
(a)

(b)

 
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