130 THE SHADOW OF THE WORLD’S FUTURE 
International economics, go seg 0 
Ishimoto, 95 
Occupation, right of, 76 
Ochorowicz, 127 
Osty, 127 
Over-population, 16, 75, 94 
K 
Keynes, 95 
Klaatsch, 79 
Knibbs, 11, 55, 57, 82, 114 
Laky, 111 
Land area, productive proportion 
of, 29 seq. 
— required by man, 28 seg. 
— used for food crops, 36 seg. 
Langdon-Down, 79 
Limiting factors to population 
growth, 12, 65 seg. 
List, 6o 
Logistic curve, 54 seg. 
Lumber. §e¢e Timber 
Pearl, 44, 54, 124 
Phosphorus, as fertilizer, 42 
Physical features of earth, 1g 
— effect on population, 59 
Possible population of world. 
See World's possible . . . 
Potash, as fertilizer, 42 
Pouctet, 79 
Pribram, 95 
Productive land, of world, 29 seg. 
col 
Quetelet, 41 
Macauliffe, 79 
Mallet, 126 
Malthus, 103, 108, 113 
Malthusianism, new, 103 seq. 
Manures. See Fertilizers 
Merz, 95 
Michael, g1 
Migration, 72 seg., 1 seq., 108, 
112 
— potential of, 75 
— racial difficulties in, 79, 86 
Mineral resources of world, 44 
Morel, 95 
Racial differences, 79 
Rate of increase of population. 
See Increase of population 
Reed, 44, 54, 124 
Rew, 61, 95 
Rignano, 124 
Rist, 95 
Sakurai, 17 
Sanger, 59 
Sea-products as food supply, 27, 
38 
Skirokogoraff, 95 
Siegert, 79 
Standards of living, 32, 46, 8o 
seq., 93, 104, 121 
Stopes, cg . 
Nationalism, national egoism, etc., 
17, 84 seq., 97 seq. 
Nitrogen, available as fertilizer, 
41