and rollers
over a plank floor.

The flight of wild ducks is estimated at 90 miles per hour, that of the
swift at 200 miles, carrier pigeons 38 miles, swallows 60 miles,
migratory birds have crossed the Mediterranean at a speed of 120 miles
per hour.

The Nile has a fall of 6 ins. in 1,000 miles. The rise of the river
commences in June, continuing until the middle of August, attaining
an elevation of from 24 to 26 feet, and flowing the valley of Egypt 12
miles wide. In 1829 it rose to 26 cubits, by which 30,000 persons were
drowned. It is a terrible climate to live in, owing to the festering
heat and detestable exhalations from the mud, etc., left on the
retiring of the Nile, which adds about 4 inches to the soil in a
century, and encroaches on the sea 16 feet every year. Bricks have
been found at the depth of 60 feet, showing the vast antiquity of the
country. In productiveness of soil it is excelled by no other in the
world.

How to Splice a Belt in Order to Make it Run Like an Endless
Belt.--Use the toughest yellow glue prepared in the ordinary way,
while hot, stirring in thoroughly about 20 per cent of its weight of
tannic acid, or extract of tan bark. Apply to the splice and quickly
clamp together. The splice should be made of scarfed edges extending
3 to 6 inches back, according to thickness of belt. The surface to be
perfectly clean and free from oil.

How Many Pounds of Coal it Requires to Maintain Steam of One-Horse
Power per Hour.--Anthracite 1-1/2 to 5 pounds, according to the
economy of boiler and engine. Bituminous and anthracite coal are very
nearly equal for equal qualities. They both vary from 7 to 10 pounds
of water evaporated per pound of coal from a temperature of 212
degrees.

A Formula for Collodio-bromide Emulsion that is Rapid.--Ether s.g.
0.720, 4 fluid ounces; alcohol s.g. 0.820, 2-1/2 fluid ounces;
pyroxyline, 40 grains; castile soap dissolved in alcohol, 30 grains;
bromide of ammonium and cadmium, 56 grains.

How to Deaden the Noise of Steam While Blowing off Through a Wrought
Iron Stand Pipe.--The sound may be much modified by enlarging the end
of the pipe like a trumpet or cone; which should be long, 20 or 30
times the diameter of the pipe, opening to 4 or 5 times its initial
size.

Why Fusible Plugs are Put in the Crown Sheet of Locomotive
Boilers.--To save the crown sheet from burning in case of low water,
when the plug melts and lets the steam and water into the fire chamber
t