So they went into the kitchen, and Susie dipped the water with the quart cup into the tin pail. "Eight," she said, when the pail would hold no more. "If the pail holds two gallons, Susie." said Uncle Robert, "how many quarts are there in one gallon?" "Four." said Susie, counting on her fingers. [Illustration: Two gallons. One quart.] "Well," said Uncle Robert as they went back into the dining-room, "now we have found how many quarts there are in a gallon; how shall we find how many gallons two hundred and sixteen thousand cubic inches will make?" "If I knew how many cubic inches there are in one gallon," said Frank, "I could do it." "How shall we find out?" asked Uncle Robert. "We might measure a gallon," said Donald, "and then if we could empty it into a flat pan couldn't we measure that?" "We can try," said Uncle Robert, "if your mother has the pan." "You may use one of those tins I bake biscuit in," said Mrs. Leonard. "I'll get it," said Susie. They measured it and found it was eleven inches long, seven inches wide, and two inches deep. The gallon of water filled it one and one half time. "If it had been three inches deep," said Frank, "the water would have just filled it." "Well," said Uncle Robert, "can you find out how many inches there are in all?" It took some time and several suggestions from Uncle Robert, but at last they found it to be two hundred thirty-one cubic inches. "Now," said Uncle Robert, "can you find how many two hundred thirty-one cubic inches there are in two hundred and sixteen thousand cubic inches?" "I know how," said Frank, figuring rapidly. In a short time he found that two hundred and sixteen thousand cubic inches would make over nine hundred thirty-five gallons. "If you were going to water the garden with the new two-gallon pail," said Uncle Robert, "how many times would you have to fill it?" "If we took two gallons at a time," said Frank, "it would be--wait a minute--it would be four hundred sixty-seven and one half." "My," said Donald, "it makes my arms ache to think of it." "I'm going to find out how much fell on the whole farm some time," said Frank, "but I'm just tired out now." "Where does all the rain come from?" asked Susie. "I don't see how so much water can stay in the clouds." "It doesn't," said Donald, laughing. "That's why it rains." "But where does it all go to?" asked Uncle Robert. "Oh," said Susie, "it just goes into the ground." "Some of it runs off into the river," said Donald. "That's what makes it rise when it rains hard." "I wonder if it has risen much to-day?" said Frank. "We might put on our rubber boots and walk down and see," said Uncle Robert. "It is clearing off finely." "It is almost supper time now," said Mrs. Leonard. "If you'll wait I'll help Jane get it ready, and then you can go as soon as it is over." So they waited, and by the time they started the sun was shining brightly. It would be a whole hour before it would set. CHAPTER XIV.