underneath, put the ends down through the loop, detail _a_, and
tighten it, detail _b_, as shown in the engraving.

[Illustration: FIG. 516. KNOTTING ON THE THREADS ON TO A STUFF EDGE AND
FORMATION OF A FLAT DOUBLE KNOT.]

KNOTTING ON THE THREADS ON TO A STUFF EDGE AND FORMATION OF A FLAT
DOUBLE KNOT (fig. 516).--Push your crochet needle through the edge of
the stuff from the right to the wrong side and catch hold of the loop,
formed by the folding in half of the thread that is to be knotted on;
pull it out to the right side, put the ends through, and tighten the
loop, detail _a_. Detail _b_ shows two double threads, knotted on near
to each other in this way, and the first tying together of the two outer
threads for the flat knot which is formed as follows: you take the two
outer of the four threads hanging down and cross the right hand one
under, and the left hand one over the two centre threads. Whilst doing
this, hold the inner ones tightly stretched out on the 3rd and 4th
fingers of the left hand, detail _b_. The manner in which the two
threads are brought back and tied together again is shown in detail _c_;
the drawing up of the threads completes the so-called flat double knot,
detail _d_. Detail _e_, of the same figure, shows two flat double knots,
side by side, and the first step towards the formation of a third,
connecting together the two right threads of the one with the two left
threads of the other.

[Illustration: FIG. 517. KNOTTING ON THREADS ONTO A KNOTTED HEADING.]

KNOTTING ON THREADS ON TO A KNOTTED HEADING (fig. 517).--Make flat
double knots as in fig. 516, detail _d_, on a double cord and then knot
on your threads on to the loops of the double knots, putting the loop
through from the right side, so that it may lie at the back. Use double
threads so that the work beneath the heading may not be too open.

[Illustration: FIG. 518. KNOTTING ON THREADS ON TO A PICOT HEADING.]

KNOTTING ON THREADS ON TO A PICOT HEADING (fig. 518).--First, crochet
a row of chain stitches, then make flat double knots on the chain, far
enough apart for the thread between to form picots on the chain, then a
second chain of crochet drawn through the picots on one side, on to
which tie triple or quadruple lengths of thread, as shown in the
engraving.

KNOTTING ON THREADS WITH ROUND PICOTS (fig. 519).--Fasten the lengths
of thread to the cushion with pins, about half a c/m. apart, fix the
cord to one of the pegs at the le