He wrote Twichell:
Day before yesterday, feeling not in condition for writing, I left the study, but I couldn't hold in--had to do something; so I spent eight hours in the sun with a yardstick, measuring off the reigns of the English kings on the roads in these grounds, from William the Conqueror to 1883, calculating to invent an open-air game which shall fill the children's heads with dates without study. I give each king's reign one foot of space to the year and drive one stake in the ground to mark the beginning of each reign, and I make the children call the stake by the king's name. You can stand in the door and take a bird's-eye view of English monarchy, from the Conqueror to Edward IV.; then you can turn and follow the road up the hill to the study and beyond with an opera-glass, and bird's-eye view the rest of it to 1883.
You can mark the sharp difference in the length of reigns by the varying distances of the stakes apart. You can see Richard II., two feet; Oliver Cromwell, two feet; James II., three feet, and so on-- and then big skips; pegs standing forty-five, forty-six, fifty, fifty-six, and sixty feet apart (Elizabeth, Victoria, Edward III., Henry III., and George III.). By the way, third's a lucky number for length of days, isn't it? Yes, sir; by my scheme you get a realizing notion of the time occupied by reigns.
The reason it took me eight hours was because, with little Jean's interrupting assistance, I had to measure from the Conquest to the end of Henry VI. three times over, and besides I had to whittle out all those pegs.
I did a full day's work and a third over, yesterday, but was full of my game after I went to bed trying to fit it for indoors. So I didn't get to sleep till pretty late; but when I did go off I had contrived a new way to play my history game with cards and a board.
We may be sure the idea of the game would possess him, once it got a fair start like that. He decided to save the human race that year with a history game. When he had got the children fairly going and interested in playing it, he adapted it to a cribbage-board, and spent his days and nights working it out and perfecting it to a degree where the world at large might learn all the facts of all the histories, not only without effort, but with an actual hunger for chronology. He would have a game not only of the English kings, but of the kings of every other nation; likewise of great statesmen, vice-chancellors, churchmen, of celebrities in every line. He would prepare a book to accompany these games. Each game would contain one thousand facts, while the book would contain eight thousand; it would be a veritable encyclopedia. He would organize clubs throughout the United States for playing the game; prizes were to be given. Experts would take it up. He foresaw a department in every newspaper devoted to the game and its problems, instead of to chess and whist and other useless diversions. He wrote to Orion, and set him to work gathering facts and dates by the bushel. He wrote to Webster, sent him a plan, and ordered him to apply for the patent without delay. Patents must also be applied for abroad. With all nations playing this great game, very likely it would produce millions in royalties; and so, in the true Sellers fashion, the iridescent bubble was blown larger and larger, until finally it blew up. The game on paper had become so large, so elaborate, so intricate, that no one could play it. Yet the first idea was a good one: the king stakes driven along the driveway and up the hillside of Quarry Farm. The children enjoyed it, and played it through many sweet summer afternoons. Once, in the days when he had grown old, he wrote, remembering:
Among the principal merits of the games which we played by help of the pegs were these: that they had to be played in the open air, and that they compelled brisk exercise.