History: Made a science, 24; Weisengruen's denial of a historical science, 34; prime movers of history, 36; historical theory formulated by Marx, 51; history ignored by Marx-critics, 89.
Hunter (Robert): 219.
Idealism: what it means in philosophy, 22; how Marx dealt with it, 31; how Hegel represented it, 31; practical idealism, 257, 271.
Ideas: influence on society, 27; their source, 27; their role in the struggle of the classes, 30, 39; rooted in reality, 182; their control by dominating class, 28, 189, 190.
Individual, the materialistic conception of History and the, 271-277.
Interest: 98, 198; 200.
Jaures (Jean), 15.
Jevons (W. S.), 88.
Kautsky (Karl), 38; 172; 174; 192; 222; 259-271.
Knies (Karl), 109.
Labor (human): the element common to all commodities, 67, 92, 93; gives the commodity its value, 68, 70, "socially necessary" not to be confused with "average," 69; when labor is wasted, 16; abstract human labor a measure of the exchange-value of commodities, 71, 90, 96; "necessary labor" and "surplus labor," 73.
Labor-Power: separated under capitalism from man's body and person, 71; source of all other commodities as well as of its own reproduction, 71; dual character, 72; as a commodity presupposes a high state of technical development, 77.
La Monte (Robert R.), 257.
Lawson (Thomas W.), 197.
Literature: (anti-Marxian), 10; 14; 20; 40; 175.
Loria (Achille), 136.
Manufacturer: 64, 65, 66; 74; 130.
Marxism: scientific character of, 12; crisis in, 12; correlation of the different parts of, 16; outline of the system,
