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The gentleman who recently walked un- der the water for the amusement of the people of Boston, accomplished his feat by means of the following apparatus:

 A large cap made of lead, with circu- lar glass in front, and weighing about 75 lbs. envelopes the head and rests upon the shoulders, to this the water tight India rubber dress is attached. The air IS con veyed into the cap by means of tubes made of India rubber cloth, through which if is propelled by forcing pump kept in the boat or vessel as the case may be. Shoes made of lead weighing several pounds each, are also worn. At the depth of "A feet no inconvenience is experienced from supporting this weight, which should be graduated according to the depth of the water.