Bobbie seemed to be thinking.
“I’ve got it,” he said suddenly. “Look here. I gave her a present on her last birthday. All we have to do is to go to the shop, hunt up the date when it was bought, and the thing’s done.”
“Absolutely. What did you give her?”
He sagged.
“I can’t remember,” he said.
Getting ideas is like golf. Some days you’re right off, others it’s as easy as falling off a log. I don’t suppose dear old Bobbie had ever had two ideas in the same morning before in his life; but now he did it without an effort. He just loosed another dry Martini into the undergrowth, and before you could turn round it had flushed quite a brain-wave.
Do you know those little books called When were you Born? There’s one for each month. They tell you your character, your talents, your strong points, and your weak points at fourpence halfpenny a go. Bobbie’s idea was to buy the whole twelve, and go through them till we found out which month hit off Mary’s character. That would give us the month, and narrow it down a whole lot.
A pretty hot idea for a non-thinker like dear old Bobbie. We sallied out at once. He took half and I took half, and we settled down to work. As I say, it sounded good. But when we came to go into the thing, we saw that there was a flaw. There was plenty of information all right, but there wasn’t a single month that didn’t have something that exactly hit off Mary. For instance, in the December book it said, “December people are apt to keep their own secrets. They are extensive travellers.” Well, Mary had certainly kept her secret, and she had travelled quite extensively enough for Bobbie’s needs. Then, October people were “born with original ideas” and “loved moving.” You couldn’t have summed up Mary’s little jaunt more neatly. February people had “wonderful memories”—Mary’s speciality.
We took a bit of a rest, then had another go at the thing.
Bobbie was all for May, because the book said that women born in that month were “inclined to be capricious, which is always a barrier to a happy married life”; but I plumped for February, because February women “are unusually determined to have their own way, are very earnest, and expect a full return in their companion or mates.” Which he owned was about as like Mary as anything could be.