Purpose of the clause 118
Definition of terms: Gibbons _v._ Ogden 118
"Commerce" 118
"Commerce" today 119
"Necessary and proper" clause 121
"Among the several States" 121
"Regulate" 123
Interstate versus foreign commerce 123
Instruments of commerce 125
Congressional regulation of waterways 126
Navigation 126
Hydroelectric power 130
Congress' jurisdiction over navigable streams today 131
Purposes for which power may be generated 131
Congressional regulation of land transportation 132
Early Acts: Federal provision for highways 132
Beginnings of federal railway regulation 132
Regulation of rates: Interstate Commerce Commission 133
Interstate Commerce Commission today 135
Shreveport Case 135
Act of 1920 and State railway rate regulation 136
Regulation of other agents of carriage and communication 137
Acts of Congress protective of labor engaged in interstate
transportation 139
Adair Case 141
Railroad Retirement Act 142
Bills of Lading: Ferger Case 143
Congressional regulation of commerce as traffic 144
Sherman Act: Sugar Trust Case 144
Sherman Act revised 146