T.—What is the climate of Labrador?
P.—Very cold.
T.—Then the climate of Britain ought to be the same?
P.—The water around it would make it not so cold.
T.—Yes. The ocean currents from the south help to make the climate milder, too. There would be plenty of rain, besides. Now, how would a moist, mild climate affect agriculture in England?
P.—They ought to be able to grow almost everything that we can.
(Similarly, many other points may be taken up and developed with the class.)