8
AN ENIGMA FOR CHRISTMAS HOLIDAYS

Formed half beneath and half above the earth,
We owe, as twins, to art our second birth.
The smith’s and carpenter’s adopted daughters,
Made upon earth, we travel on the waters.
Swifter we move as tighter we are bound,
Yet never touch the sea, or air, or ground.
We serve the poor for use, the rich for whim,
Sink if it rains, and if it freezes swim.

[Solution]

No. XVII.—LARGER AUXILIARY MAGIC SQUARES

A very interesting method of constructing a Magic Square is shown in these three diagrams:—

1234567891011
3456789101112
5678910111234
7891011123456
9101112345678
1112345678910
2345678910111
4567891011123
6789101112345
8910111234567
1011123456789
0112233445566778899110
3344556677889911001122
6677889911001122334455
9911001122334455667788
1122334455667788991100
4455667788991100112233
7788991100112233445566
1100112233445566778899
2233445566778899110011
5566778899110011223344
8899110011223344556677
11325374961738597109121
364860728496108120111224
718395107119102223354759
10611892133344658708294
20324445576981931051178
55566880921041167193143
79911031156183042546667
11451729415365777890102
28405264768889101113416
63758799100112315273951
98110111214263850627486

It will be noticed that each row after the first, in the two upper auxiliary squares, begins with a number from the same column in the row above it, and maintains the same sequence of numbers. When the corresponding cells of these two squares are added together, and placed in the third square, a Magic Square is formed, in which 671 is the sum of all rows, columns, and diagonals.

No. XVIII.—SQUARING BY ANNO DOMINI