He often studied his records, examining and poring over them with
absorbing interest until far into the night; but what he found there--if
he found anything--he revealed to no one. Sometimes he copied on paper
the involved and delicate pattern left by the ball of the finger, and
then vastly enlarged it with a pantograph so that he could examine its
web of curving lines with ease and convenience.

One sweltering afternoon--it was the first day of July, 1830--he was at
work over a set of tangled account books in his workroom, which looked
westward over a stretch of vacant lots, when a conversation outside
disturbed him. It was carried on in yells, which showed that the people
engaged in it were not close together.

"Say, Roxy, how does yo' baby come on?" This from the distant voice.

"Fust-rate. How does _you_ come on, Jasper?" This yell was from close
by.

"Oh, I's middlin'; hain't got noth'n' to complain of, I's gwine to come
a-court'n you bimeby, Roxy."

"_You_ is, you black mud cat! Yah--yah--yah! I got somep'n' better to
do den 'sociat'n' wid niggers as black as you is. Is ole Miss Cooper's
Nancy done give you de mitten?" Roxy followed this sally with another
discharge of carefree laughter.

"You's jealous, Roxy, dat's what's de matter wid you, you
hussy--yah--yah--yah! Dat's de time I got you!"

"Oh, yes, _you_ got me, hain't you. 'Clah to goodness if dat conceit o'