Evolution in Shipbuilding—I
The Wonderful Progress of the Past Century
Features
Recent Studies of Pasteurized and Boiled Milk
Non-Porous Alloy Castings
Aerial Torpedoes
Old Devices That Have Been Revived During the Present War
A Chimney Periscope
Hints on Judging Diamonds
The Spiders in Flowers
School-Spread of Contagious Disease
A Source of Epidemics That is Neglected by Officials and Physicians
The Periscope of the Submarine
Some Noted Zoological Parks
The Zoological Gardens of Melbourne
The Chinese Calendar
Coke as a Boiler Fuel
Explosives
Interesting Facts Relating to Their History and Nature
Protecting Motors Against Dust
The Early Days of the Railroad
Temperature Inversions in Relation to Frost
Methods for Anticipating Critical Periods and Protecting Crops
Metallographic Description of Ancient Peruvian Bronzes
Studies That Throw Light on Methods of Manufacture
