Of course

" we can, George," she cried. But she was prejudiced
in Wendy's favour, and he was really the grander character of the
two.

"Remember mumps," he warned her almost threateningly, and off
he went again. "Mumps one pound, that is what I have put down,
but I daresay it will be more like thirty shillings -- don't
speak -- measles one five, German measles half a guinea, makes
two fifteen six -- don't waggle your finger -- whooping-cough,
say fifteen shillings" -- and so on it went, and it added up
differently each time; but at last Wendy just got through,
with mumps reduced to twelve six, and the two kinds of measles
treated as one.