Or, Chart C Clarification for Duxbury Point.
In my honest opinion, The stitch count varies in Chart C' s even/odd number rows in the Duxbury Point pattern. The variance isn't charted. From #5 through row #21, you are going to find that than the actual number of purl stitches in the knitting, VS the charted number are different.
I won't say these are errors in Chart writing but the correct number of purl stitches indicated in the chart is short through row 21. If the following information had been provided, I would have had an easier time getting started on this project. I think that other knitters may have had or will have a problem. This post is for those knitters. I hope they find this post helpful. Chart C is on the left of this picture. Chart D is in the center of the piece.
I have gone back to the chart and written out the stitch count changes that I used, and the purl sequences between the cables on the right side of the knitting. Eventually, the chart gets back to 21 stitches per row - at least as far as I have knitted. As I finish Chart C. I will watch for other problem areas if there are any.
The instructions warned that stitch count would change from 21 stitches. From lace knitting, we expect/hope the designer will let us know how many stitches to expect at the end of each row or two. Delayed decreases are common but they usually don't take 15 rows+ to complete.
I don't think this chart shows the correct number of stitches to count or to expect on Chart C. Looks like they ran out of room to print the Chart and the editors someone took out some purl symbols or the designer thought we were all experienced Aran knitters and could figure it out. Since I have reading difficulties, this was a big frustration to me.
The majority of stitch additions occur on the WS rows and in the purl stitch count is between the cables. The Chart does not reflect the change in those purl stitches. They tell you to 'assume' there is 21 stitches in each row of Chart C. I have included a close up of my knitted version of Chart C up to row 21. If anyone disagrees that I am counting correctly, please send me an email to my home address, and I will correct any error I made in typing or counting.
If you look at the count, you see that purl increases show up every 4th row. Accounting for the KBK increases in single stitches on those rows. The decreases don't catch up for 15 rows. As promised, the stitch count winds up at 21 again. I am looking forward to seeing how the rest of the Chart works out. Since there is no stitch key included, the - - - are Knit stitches on WS rows and Purl stitches on right side rows, as usual.
Row 5: 21 stitch count 
Row 6: 23 stitches
Row 7: 23 stitches with 7 purls
Row 8: 25 stitches
Row 9: 25 stitches with 11 purls
Row 10: 27 stitches
Row 11: 27 stitches, 15 purl stitches
Row 12: 29 stitches
Row 13: 29 stitches, 19 purl stitches
Row 14: 27 stitches
Row 15: 27 stitches, 15 purl stitches
Row 16: 25 stitches
Row 17: 25 stitches, 11 purl stitches
Row 18: 23 stitches
Row 19: 23 stitches, 7 purl stitches
Row 20: 21 stitches
Row 21: 21, stitches, 3 purl stitches
The ribbing and 21 rows of Charts, A,B,C, D