When Sally and Nick's maple tree won't grow, the Cat in the Hat knows who to call--Dr. Twiggles--who suggests they inspect its roots. A trip underground in the Thinga-ma-jigger is undertaken, and sure enough, the maple tree needs water (which Things One and Two procure in ridiculous overabundance) and sun (which the Cat suppliments with a Brighta-ma-lighter). But as for getting syrup from the young sapling?