Michael Harvey
One card from Michael Harvey's White Papers [set of 71 5 x 8 inch index cards (NY: 1971)]:

the practice comma art comma method comma or system of inserting points or open single quote periods closed single quote to aide the sense comma in writing or printing semicolon division into sentences comma clauses comma etc period by means of points or periods period other punctuation marks comma e period g period exclamation marks comma question marks comma refer to the tone or structure of what precedes them period a sentence can contain any of these symbols comma its termination marked by a period period

The practice, art, method, or system of inseritng points or (periods) to aid the sense, in writing or printing; division into sentences, clauses, etc. by means of points or periods. Other punctuation marks, e.g. exclamation marks, question marks, refer to the tone or structure of what precedes them. A sentence can contain any of these symbols, its termination marked by a period.