When the figure is placed on a jet d'eau, that plays in a perpendicular direction, it will be suspended on the top of the water, and perform a great variety of amusing motions. If a hollow ball of very thin copper, of an inch diameter, be placed on a similar jet, it will remain suspended, turning round, and spreading the water all about it. _A Person having put a Ring an one of his Fingers, to name the Person, the Hand, the Finger, and the Joint on which it is placed._ Let a third person double the number of the order in which he stands who has the ring, and add 5 to that number; then multiply that sum by 5, and to the product add 10. Let him next add 1 to the last number, if the ring be on the right hand, and 2 if on the left, and multiply the whole by 10: to the product of this he must add the number of the finger, (counting the thumb as the first finger,) and multiply the whole again by 10. Let him then add the number of the joint, and, lastly, to the whole join 35. He is then to tell you the amount of the whole, from which you are to subtract 3535, and the remainder will consist of four figures; the first of which will express the rank in which the person stands, the second the hand, (number 1 signifying the right, and 2 the left,) the third number the finger, and the fourth the joint.--For example: Suppose the person who stands the third in order has put the ring upon the second joint of the thumb of his left hand; then, The double of the rank of the third person is 6 To which add 5 ____ 11 Multiply the sum by 5 ____ 55 To which add 10 And the number of the left hand 2 ____ 67 Which being multiplied by 10 ____ 670 To which add the number of the thumb 1 ____ 671 And multiply again by 10 ____ 6710 Then add the number of the joint 2 And lastly the number 35 ____ 6747 From which deducting 3535 ____ The remainder is 3212 ____