I don't know when that will be," he added with a sigh, "as I hate rule of three and can't do it." "Rule of three," said Isobel, "I'm quite good at it.

You see I like figures.

My father says it is the family business instinct.

Here, let me try.

Move to the other side of that big chair, there's plenty of room for two, and show it to me." He obeyed with alacrity and soon the brown head and the fair one were bent together over the scrawled sheet.