Mr. Kidd sees these problems, but he gropes blindly when he tries to forecast their solution. He sees that the progress of mankind in past ages can only have been made under and in accordance with certain biological laws, and that these laws continue to work in human society at the present day. He realizes the all-importance of the laws which govern the reproduction of mankind from generation to generation, precisely as they govern the reproduction of the lower animals, and which, therefore, largely govern his progress. But he makes a cardinal mistake in treating of this kind of progress. He states with the utmost positiveness that, left to himself, man has not the slightest innate tendency to make any onward progress whatever, and that if the conditions of life allowed each man to follow his own inclinations the average of one generation would always tend to sink below the average of the preceding. This is one of the sweeping generalizations of which Mr. Kidd is fond, and which mar so much of his work. He evidently finds great difficulty in stating a general law with the proper reservations and with the proper moderation of phrase; and so he enunciates as truths statements which contain a truth, but which also contain a falsehood. What he here says is undoubtedly true of the world, taken as a whole. It is in all probability entirely false of the highest sections of society. At any rate, there are numerous instances where the law he states does not work; and of course a single instance oversets a sweeping declaration of such a kind. There can be but little quarrel with what Mr. Kidd says as to the record of the world being a record of ceaseless progress on the one hand, and ceaseless stress and competition on the other; although even here his statement is too broad, and his terms are used carelessly. When he speaks of progress being ceaseless, he evidently means by progress simply change, so that as he uses the word it must be understood to mean progress backward as well as forward. As a matter of fact, in many forms of life and for long ages there is absolutely no progress whatever and no change, the forms remaining practically stationary. Mr. Kidd further points out that the first necessity for every successful form engaged in this struggle is the capacity for reproduction beyond the limits for which the conditions of life comfortably provide, so that competition and selection must not only always accompany progress, but must prevail in every form of life which is not actually retrograding. As already said, he accepts without reservation the proposition that if all the individuals of every generation in any species were allowed to propagate their kind equally, the average of each generation would tend to fall below the preceding.