Pure vs. Applied Science
The Solution of Human Interest Problems, Rather Than Theories Demanded
Features
Hereditary Reaction-System Relations
An Extension of Mendelian Concepts
The X-Ray Spectrum
How They Are Formed and Consequences of the Present Theory
A Perfume Diffuser
Gilsonite and Grahamite: The Result of the Metamorphism of Petroleum under a Particular Environment
Electrical Experiments with Scent-Holding Fogs
United States Standard Baumé Hydrometer Scales
Our National Parks
Play-Grounds for the People Unsurpassed in the World
Bird Migration—II
Wonderful Journeys Between Summer and Winter Homes
The Minimum Radiation Visually Perceptible
Pyrometers on Locomotives
Charging Small Storage Batteries
Various Methods, Devices and Connections
Improved “Magnetos”
The Wind as an Earth Sculptor
Natural Dyestuffs
A Revival of Long Abandoned Methods
