"Now, father, have we not done well to-day!" cried Jack, "did you ever see such splendid crawfish? Oh, there were thousands of them, and I am sure we have got two hundred here at least. Just look at their claws!" "No doubt you were the discoverer of these fine crabs, eh, Jack?" said I. "No! fancy young Franz being the lucky man!" answered he. "He and I went toward the stream while mother was busy, just to look for a good place for the bridge. Franz was picking up pebbles and alabasters, some because they were so pretty, some to strike sparks with in the dark, and some, he insisted, were 'gold.' 'Jack! Jack!' cried he presently, 'come and see the crabs on Fritz's jackal!' You know we threw it away there, and to be sure it was swarming with these creatures. Are you glad we have found them, father? Will they be good to eat?" "Very excellent, my boy, and we may be thankful that food for our wants is thus provided day by day." When each party had related the day's adventures, and while the mother was cooking the crawfish, we went to bring our store of planks to land. Even this apparently simple operation required thought, and I had to improvise rope-harness for the cow and the donkey, by which we could make them drag each board separately from the water's edge to the margin of the stream. Jack showed me where he thought the bridge should be, and I certainly saw no better place, as the banks were at that point tolerably close to one another, steep, and of about equal height. "How shall we find out if our planks are long enough to reach across?" said I. "A surveyor's table would be useful now." "What do you say to a ball of string, father?" said Ernest. "Tie one end to a stone, throw it across, then draw it back and measure the line!" Adopting my son's idea, we speedily ascertained the distance across to be eighteen feet. Then allowing three feet more at each side, I calculated twenty-four feet as the necessary length of the boards.