On the wall, near the slat-frame, there was an outline drawing of the ship, and this betrayed the fact that this vessel has twenty-two considerable lakes of water in her. These lakes are in her bottom; they are imprisoned between her real bottom and a false bottom. They are separated from each other, thwartships, by water-tight bulkheads, and separated down the middle by a bulkhead running from the bow four-fifths of the way to the stern. It is a chain of lakes four hundred feet long and from five to seven feet deep. Fourteen of the lakes contain fresh water brought from shore, and the aggregate weight of it is four hundred tons. The rest of the lakes contain salt water—six hundred and eighteen tons. Upwards of a thousand tons of water altogether. Think how handy this ballast is. The ship leaves port with the lakes all full. As she lightens forward, through consumption of coal, she loses trim—her head rises, her stern sinks down. Then they spill one of the sternward lakes into the sea, and the trim is restored. This can be repeated right along as occasion may require. Also, a lake at one end of the ship can be moved to the other end by pipes and steam pumps. When the sailor changed the slat-frame to-day, he was posting a transference of that kind. The seas had been increasing, and the vessel’s head needed more weighting, to keep it from rising on the waves instead of ploughing through them; therefore, twenty-five tons of water had been transferred to the bow from a lake situated well towards the stern. A water compartment is kept either full or empty. The body of water must be compact, so that it cannot slosh around. A shifting ballast would not do, of course. The modern ship is full of beautiful ingenuities, but it seems to me that this one is the king. I would rather be the originator of that idea than of any of the others. Perhaps the trim of a ship was never perfectly ordered and preserved until now. A vessel out of trim will not steer, her speed is maimed, she strains and labours in the seas. Poor creature! for six thousand years she has had no comfort until these latest days. For six thousand years she swam through the best and cheapest ballast in the world, the only perfect ballast, but she couldn’t tell her master, and he had not the wit to find it out for himself. It is odd to reflect that there is nearly as much water inside of this ship as there is outside, and yet there is no danger. NOAH’S ARK