Investigations at the Cryogenic Laboratory at Leyden
Conservator of the Physical Laboratory of the University of Leyden
Features
On the Persistence in Superconductors of Electric Currents without Electromotive Force
An Automatic Mercury Pump
Coal and its by-Products—II
How and of What Coal Was Formed, and Some Account of Its Utilization
The “Britannia” Airship
Aerial Reconnaissance during Sieges
Its Important Influence on Artillery Attack and Defense
Linking India and Ceylon by Railway
Difficulties of Bridge Construction with Native Labor
Preserving Eggs
The Thyroid and Thymus in Relation to Development
Stains and their Cures
The Principles and Theory of Mutation
The Evolution of Species, Not a Slow Process, but Takes Place by Leaps
An Idiot's New Brain
Producer Gas for Industrial Purposes
Economy and Convenience Where Both Power and Heat are Required
Amputations Less Frequent in War
The Flying Machine from an Engineering Standpoint—IV
A Review of Recent Progress
