From Lynne Truss, #4

Lynne Truss pictures the comma has a sheepdog in this April 28 entry from her 2009 Eats, Shoots and Leaves calendar. Out of the 365 pages, I saved just a handful. Here’s #4:

Between the 16th century and the present day, the comma became a kind of scary grammatical sheepdog. The comma has so many jobs as “separator” (punctuation marks are traditionally either “separators” or “terminators”) that it tears about on the hillside of language, endlessly organizing words into sensible groups and making them stay put; sorting and dividing; circling and herding; and, of course, darting off with a peremptory “woof” to round up an wayward subordinate clause that makes a futile bolt for semantic freedom.