For real economic theory his book is quite useless. Economists do not recognise the needs of things and plants and animals, but only human needs, or those of man in so far as he is _homo oeconomicus_ and hence a conscious being. I too believe that it is right to work out philosophically the principle of economics; but in order to do this, Trivero should have studied economic science. He declares that 'he does not want to hold fast to anyone's petticoats.' This statement is superfluous if it means that each individual ought to base his own scientific convictions on reason and not on authority. It is dangerous if it signifies, on the contrary, an intention to spare himself the trouble of studying other people's books, and of reconstructing everything from the beginning by his own personal efforts and by the aid of general culture alone. The result obtained--being far from satisfactory--should deter the author (who will not grumble at my plain speaking), from returning to this unfruitful method in the future. [100] PARETO answers this second letter in the _Giornale degli economisti_, February, 1901, pp. 131-138. INDEX OF NAMES* *Marx's name is omitted. The Asterisks indicate notes. Aristotle, 18 Aveling, E., 66* Bauer, B., 102 Bernstein, E., 119 Bertolini, A., 96 Böhm-Bawerk, 54, 76,* 142 Bray, 103 Coletti, F., 115* Croce, B., 129,* 131* Dühring, E. 69, 79,* 84, 103, 114 Durckheim, E., 118 Ehrenfels, Christian Von, 168, 172 Engels, F., 7, 11, 14, 18, 19, 25, 26, 28, 41, 55, 63, 67, 69, 78-81, 83, 84, 89, 95,* 103, 114-116, 124, 131* Fechner, 180 Ferrara, F., 127 Gentile, G., 80,* 83,* 86,* 104,* 115* Gray, A., 103 Graziadei, A., 138-140, 179* Grosse, E., 90* Hegel, G.F., 6, 11, 81-82, 102, 122, 130 Heine, H., 130 Helvetius, 8 Herbart, 24, 25 Holbach, 8 Kant, E., 24, 25, 43, 113-114, 179 Kautsky, K., 119, 137 Ingram, 95* Jevons, 72 Labriola, Antonio, 1, 5, 9, 10-15, 18, 21-26, 51,* 55, 76, 84,* 86-93, 106, 109,* 110, 111, 114, 119, 120-132 Lange, A.F., 8, 41, 71, 72* Leibniz, 160 Loria, A., 49, 91, 138, 142 Machiavelli, N., 110,* 118 Manzoni, A., 19 Mommsen, T., 122 Morgan, 89 More, Thomas, 19* Pantaleoni, M., 76,* 96, 127, 171 Parrto, V., 74, 76,* 96-101, 159-186 Plechanow, G., 8 Proudhon, P.G., 103 Rabelais, 105 Ricardo, D., 53, 135, 156, 157* Ricca, Salermo G., 77* Richter, G.P., 18 Rodbertus, K., 103* Rosmini, 102 Rümalin, 36 Sanctis (de), F., 110* Schiller, 25* Schmidt, C., 54 Schopenhauer, A., 102 Simmel, G., 5, 24, 118 Smith, A., 74* Sombart, W., 54,* 55, 60, 63, 131,* 142 Sorel, G., 55, 86,* 119, 131-138 Spencer, H., 36, 178 Stammler, R., 27-47, 118, 137,* 138, 170 Stein, L., 18 Stern, G., 133 Trivero, C, 181,* 182 Villari, P., 110* Wagner, A., 73* Westermarck, E., 90* Witte, 78 Wundt, 180* EDINBURGH; J.C. THOMSON AT THE MERCAT PRESS * * * * *