This section is from the book "School Needlework. A Course of Study in Sewing designed for use in Schools", by Olive C. Hapgood. Also available from Amazon: School Needlework: A Course Of Study In Sewing Designed For Use In Schools.
A patch in stockinet can be put in almost invisibly as follows: cut a square or oblong hole in the stockinet, carefully, by a thread, and ravel the sides until the loops are even; cut the patch, by a thread, the exact size of the hole, and clear the loops; graft in the top and lower edges, and Swiss-darn the side edges together, working over four or five stitches at each side of the joining.
What is grafting? What is first done? How are the edges placed together? How are the stitches taken? How are the stitches taken in Swiss darning?