The captions of the Single and Half Left Wrist Action Variations are wrong and should be reversed. This error has a long and persistent history:
The First Edition of TGM appeared in 1969 with an Errata page that contained fourteen errors. The eleventh of these was as follows:
"11. Page 111 Photos 10-18-C & -D are interchanged."
The error was corrected in the second edition (1971) and remained corrected in the third (1975). Inexplicably, it reappeared when the photo layouts changed in the fourth edition (1979) and went uncorrected in the fifth and sixth editions (1980 and 1982). In his 96 pages of corrections and amplifications slated for the as-yet-unpublished seventh edition, Homer notes that the typeface for the number and caption of paragraph 10-18-C is wrong and also that the next to last line that the word MOTION should be changed to MOVEMENT.
Nevertheless, the photo caption error persists. What to do? Follow Homer's 1969 prescription and manually re-label the photos.