It is stated that the above calculation took three years to complete.

REMARKABLE INSCRIPTION.

The following singular inscription is to be seen carved on a tomb situated at the entrance of the church of San Salvador, in the city of Oviedo. The explanation is that the tomb was erected by a king named Silo, and the inscription is so written that it can be read 270 ways by beginning with the large S in the center. The words are Latin, "Silo princeps fecit."

T I C E F S P E C N C E P S F E C I T
I C E F S P E C N I N C E P S F E C I
C E F S P E C N I R I N C E P S F E C
E F S P E C N I R P R I N C E P S F E
F S P E C N I R P O P R I N C E P S F
S P E C N I R P O L O P R I N C E P S
P C C N I R P O L I L O P R I N C E P
E E N I R P O L I S I L O P R I N C E
P E C N I R P O L I L O P R I N C E P
S P E C N I R P O L O P R I N C E P S
F S P E C N I R P O P R I N C E P S F
E F S P E C N I R P R I N C E P S F E
C E F S P E C N I R I N C E P S P E C
I C E F S P E C N I N C E P S F E C I
T I C E F S P E C N C E P S F E C I T

Besides this singular inscription, the letters H. S. E. S. S. T. T. L. are also carved on the tomb, but of these no explanation is given. Silo, Prince of Oviedo, or King of the Asturias, succeeded Aurelius in 774, and died in 785. He was, therefore, a contemporary of Charlemagne. No doubt the above inscription was the composition of some ingenious and learned Spanish monk.

CURIOUS CALCULATIONS.

CONSUMPTION OF AIR IN ACTIVITY AND REPOSE.

Dr. Radclyffe Hall makes the following interesting statement with regard to the amount of air we consume in repose, and at different degrees of activity: When still, we use 500 cubic inches of air in a minute; if we walk at the rate of one mile an hour, we use 800; two miles, 1,000; three miles an hour, 1,600; four miles an hour, 2,300. If we run at six miles an hour, we use 3,000 cubic inches; trotting a horse, 1,750; cantering, 1,500.

THE VALUE OF LABOR.

Cast iron of the value of £1 sterling is worth, converted into ordinary machinery, £4; in larger ornamented work, £45; in buckles and similar kinds of fancy work, £600; in neck chains, £1,300. Bar iron of the value of £1 sterling is worth, in the form of knives, £36; needles, £70; penknife blades, £950; polished buttons and buckles, £890; balance springs of watches, £5,000.