Prehistoric Classification
Steps in the Determination of the Age of Man
Features
Influence of the Fineness of Division of Pulverized Limestone on Crop Yield
Demagnetization of Iron
Magic Behind the Trenches
Technical Work as Important as Fighting
Magnetization by Rotation
Some New Paper-Making Materials
The Fish Louse: Argulus Foliaceus L
Chemical Laboratory Porcelain
War-Time Smuggling
Burmese Black Varnish or Lacquer
Archeological Notes on the Danish West Indies
The Petroglyphs of The Island of St. John and of Congo Cay
Arc Light Efficiency
Black Photographic Images Produced by Kathode Ray
Catalytic Decomposition of Benzoyl Chloride
Pruning Fruit Tree Roots
Rainfall with Air Temperature below the Freezing-Point
Sisal
How the Sun, Earth and Moon Move
Illustrated by an Ingenious Mechanical Model
Appetite of the Mole
Coal and its Undiscovered Riches
Permanent Magnets
The Effect of Chemical Composition, Shape, Dimensions, Heat, Treatment and Usage