[…]all shirt-waisted and saddle-oxforded and pleading loudly: “Teach me. Teach me. Teach me.”

I'm waiting for my date.

The metanephros develops from an outbranch of the wolffian duct called the ureteric bud that extends into a mass of undifferentiated metanephric mesenchyme.

William S. Baring-Gould was one of our most knowledgeable Sherlockians and a scholarly, prolific writer.