From 8-year old Hilda’s diary:

At the lunch table today, Grandfather said he had something very important to tell me. He said that I am getting to be a big girl and it is time I learned something about money, and the best way to learn about it, is to earn it. So he is going to give me a job. From now on, I shall get a penny for every flea I catch on Brownie, and every bug I find on Grandfather’s rose bushes. He said it is a fine job because I may work every day in the week and I may choose my own hours.