I have felt at liberty to take up a considerable degree of room with it.
When I had learned the name and position of every visible feature of the river; when I had so mastered its shape that I could shut my eyes and trace it from St. Louis to New Orleans; when I had learned to read the face of the water as one would cull the news from the morning paper; and finally, when I had trained my dull memory to treasure up an endless array of soundings and crossing-marks, and keep fast hold of them, I judged that my education was complete: 
"WEARING A TOOTHPICK."
so I got to tilting my cap to the side of my head, and wearing a toothpick in my month at the wheel. Mr. Bixby had his eye on these airs. One day he said,—
"What is the height of that bank yonder, at Burgess's?"
"How can I tell, sir? It is three quarters of a mile away."
"Very poor eye—very poor. Take the glass."
I took the glass, and presently said,—
"I can't tell. I suppose that that bank is about a foot and a half high."
"Foot and a half! That 's a six-foot bank. How high was the bank along here last trip?"
"I don't know; I never noticed."
"You did n't? Well, you must always do it hereafter."
"Why?"
"Because you 'll have to know a good many things that
