15th: 9 treble at the top of the nine treble of last round, ch. 6, work 1 double in the centre of the twelve chain of last round, ch. 6, and repeat round, plain 1, and fasten off.
16th: 7 treble at the top of the nine treble of last round, ch. 8, work 1 treble at the top of the one double of last round, ch. 2, work 1 treble in the same loop as before, ch. 8, and repeat round; plain 1, and fasten off.
17th: 5 treble at the top of seven treble of last round, ch. 6, work 1 treble in the centre of the two chain of last round, then ch. 3, and work one treble three times more in the same loop as before, ch. 6, and repeat round, plain 1, and fasten off.
18th: 3 treble at the top of the five treble of last round, ch. 4, work 2 treble in the first three chain of last round, ch. 3, work 2 treble in the same loop as before, ch. 1, and work the same in the next two three chains of last round, ch. 4, and repeat round, plain 1, and fasten off.
19th: 2 treble at the top of the three treble of last round, ch. 2, then work as follows in each of the three chains of last round, 3 treble, ch. 3, work 3 treble all in the first three chain of last round, ch. 2, and work the same in the next two three chains of last round, ch. 2, and repeat round, plain 1, and fasten off.
20th: 1 treble at the top of the two treble of last round, then work as follows in each of the three chains of last round, 3 treble, ch. 3, work 3 treble in the same loop as before, ch. 3, and repeat the same in the next two three chains of last round, repeat round, plain 1, and fasten off, which completes the d'oyley.