THE FRANKFORT AND OFFENBACH ELECTRIC RAILWAY.
POSSIBILITIES OF THE TELEPHONE.
PYROMETERS.
THE TEMPERATURE OF THE SOLAR SURFACE.
CHEMICAL NATURE OF STARCH GRAINS.
THE AMALGAMATION OF SILVER ORES.
INTERESTING FACTS ABOUT PLATINUM.
BAYLE'S LAMP CHIMNEY.
MODERN LOCOMOTIVE PRACTICE.
SCREW STEAM COLLIER FROSTBURG.
A thirteen year old girl, who is perfect in other ways, but who
has simply little blue spots that puff out slightly where her eyes
should be, is said to be living at Amherst, Portage County,
Wisconsin.
DESTRUCTION OF THE TARDES VIADUCT.
JOY'S REVERSING AND EXPANSION VALVE GEAR.
THE STEAM BELL.
LIEUT. GREELY BEFORE THE BRITISH ASSOCIATION.
DIAMOND MINING IN BRAZIL.
WHAT WE REALLY KNOW ABOUT ASIATIC CHOLERA.
DR. KOCH ON THE CHOLERA.
MALARIA.—THE
NATURAL PRODUCTION OF MALARIA
HALESIA HISPIDA.
WINDFLOWERS.
STORY OF LIEUT. GREELY'S RECOVERY.
THE CAY MONUMENT AT UXMAL.
Rolled gold is made by casting an ingot of brass, and while this
is still hot pouring upon it a thin layer of gold alloy. The ingot
when cold is forced between steel rollers until a long, thin ribbon
is produced, of which the proportion of gold and brass is the same
as of the ingot. The percentage of gold is reduced as low as two
and three per cent. This rolled gold is used in making cheap
bracelets and watch chains. It wears from one to ten years.
