Fix typo

’a’ -> ‘A’

src/epub/text/the-chair-of-philanthromathematics.xhtml

@@ -15,7 +15,7 @@
 			<p>“It is,” said Jeff. “I never told you about the time when me and Andy Tucker was philanthropists, did I? It was eight years ago in Arizona. Andy and me was out in the Gila mountains with a two-horse wagon prospecting for silver. We struck it, and sold out to parties in Tucson for $25,000. They paid our check at the bank in silver⁠—a thousand dollars in a sack. We loaded it in our wagon and drove east a hundred miles before we recovered our presence of intellect. Twenty-five thousand dollars doesn’t sound like so much when you’re reading the annual report of the Pennsylvania Railroad or listening to an actor talking about his salary; but when you can raise up a wagon sheet and kick around your bootheel and hear every one of ’em ring against another it makes you feel like you was a night-and-day bank with the clock striking twelve.</p>
 			<p>“The third day out we drove into one of the most specious and tidy little towns that Nature or Rand and McNally ever turned out. It was in the foothills, and mitigated with trees and flowers and about 2,000 head of cordial and dilatory inhabitants. The town seemed to be called Floresville, and Nature had not contaminated it with many railroads, fleas or Eastern tourists.</p>
 			<p>“Me and Andy deposited our money to the credit of Peters and Tucker in the Esperanza Savings Bank, and got rooms at the Skyview Hotel. After supper we lit up, and sat out on the gallery and smoked. Then was when the philanthropy idea struck me. I suppose every grafter gets it sometime.</p>
-			<p>“When a man swindles the public out of a certain amount he begins to get scared and wants to return part of it. And if you’ll watch close and notice the way his charity runs you’ll see that he tries to restore it to the same people he got it from. As a hydrostatical case, take, let’s say, ‘A.’ ’a’ made his millions selling oil to poor students who sit up nights studying political economy and methods for regulating the trusts. So, back to the universities and colleges goes his conscience dollars.</p>
+			<p>“When a man swindles the public out of a certain amount he begins to get scared and wants to return part of it. And if you’ll watch close and notice the way his charity runs you’ll see that he tries to restore it to the same people he got it from. As a hydrostatical case, take, let’s say, ‘A.’ ‘A’ made his millions selling oil to poor students who sit up nights studying political economy and methods for regulating the trusts. So, back to the universities and colleges goes his conscience dollars.</p>
 			<p>“There’s ‘B’ got his from the common laboring man that works with his hands and tools. How’s he to get some of the remorse fund back into their overalls?</p>
 			<p>“ ‘Aha!’ says ‘B’, ‘I’ll do it in the name of Education. I’ve skinned the laboring man,’ says he to himself, ‘but, according to the old proverb, “Charity covers a multitude of skins.” ’</p>
 			<p>“So he puts up eighty million dollars’ worth of libraries; and the boys with the dinner pail that builds ’em gets the benefit.</p>