In fishing, if the current is slight, the boat is permitted to drift therewith, and if there is little or no current, it is propelled by oars as may be required. The diver—fully dressed in the rubber suit with helmet, etc.,—goes overboard easily by means of a Jacob’s ladder of five or six rungs on the port side of the boat, and is lowered by an attendant, who gives close attention to the lines, the crew having manned the pump in the meantime. On reaching bottom, the diver walks along, following the course of the moving boat and swinging his shoulders from side to side to take in a wide vision in his search for oysters. In clear water he can discover them at a distance of twenty-five or thirty feet, even when fifteen fathoms below the surface; but sometimes the water is so clouded that it may be necessary for him to go almost on hands and knees to see them, and when the seaweeds are thick and high, he may locate them almost as much by feeling as by sight. Owing to this difficulty in seeing the oysters, the work is suspended in rough weather and for many days following. The catch is placed in a sack or basket of quarter inch rope, which is raised when filled, emptied, and returned to the bottom by means of a rope. Finding the shell is by no means an easy matter, and much natural hunter-craft is necessary. Of a neutral color, it is not at all conspicuous as it lies on a gray coral bed, itself covered with coral or sponge or hidden in dense masses of gorgeous seaweeds. Still less visible is the shell on a muddy bottom, for there it embeds itself and exposes only half an inch or so of the “lip.” As the boat is impelled by the tide, the diver may have to walk rapidly in a swinging gait; and if he should stumble or fall while stooping to pick up the shell, recovery of balance may be difficult. He must be constantly on the alert and has many dangers to avoid. Sharks are numerous in these clear tropical waters; but although disaster sometimes results, they are timid, a stream of air bubbles from the sleeve of the dress sending them away in fright. More fruitful sources of danger are fouled air-pipes, broken pumps, falling into holes, and especially paralysis from recklessly deep diving. When the diver wishes to come up, he closes the escape valve in his helmet; his dress fills and distends with air, causing a speedy return to the surface, and the tender hauls him alongside by means of the life-line. After “blowing” for a few minutes with the helmet removed, and usually enjoying the indispensable cigarette, he returns to the bottom.