Mrs. Curwen is Annie Jessey Gregg Curwen. She is the daughter-in-law of John Curwen. John Curwen happens to be the man that made sol-fa famous (Do, Re, Mi, Fa, Sol, La, Ti, Do).
“Do tell me who taught you to build your nest,” entreated the thistle, half expecting to give offence, yet wishing to ask the question. But no offence was taken, and the rook, after an instant of grave consideration, replied, “Why, you see, I understand it all, for I am what is called a genius.”