Quackery in 1910

Hopefully people had figured out by the early 20th century how to recognize a quack, because they sure weren't going to learn much from the 1910 edition of the extremely popular Gould's A Pocket Medical Dictionary. Apparently the makers of the pocket-sized dictionary tried to keep its definitions as tiny as its pages. The problem with that plan was that, at least in the case of the words "quack" and "quackery," the reader was no better off reading the dictionary than he was when he had it stuffed in his pocket:

Quack: One who practices quackery.
Quackery: Medical charlatanism.
Charlatan: A quack.

Oh. Now I understand.