indiscriminately is about as wise a procedure as Triptolemus Yellowley’s application of the agricultural directions in Virgil’s “Georgics” to his farm in the Shetland Isles. It is the clear and strong light in which Riehl places this important position that in our opinion constitutes the suggestive value of his books for foreign as well as German readers. It has not been sufficiently insisted on, that in the various branches of Social Science there is an advance from the general to the special, from the simple to the complex, analogous with that which is found in the series of the sciences, from Mathematics to Biology. To the laws of quantity comprised in Mathematics and Physics are superadded, in Chemistry, laws of quality; to these again are added, in Biology, laws of life; and lastly, the conditions of life in general branch out into its special conditions, or Natural History, on the one hand, and into its abnormal conditions, or Pathology, on the other. And in this series or ramification of the sciences, the more general science will not suffice to solve the problems of the more special. Chemistry embraces phenomena which are not explicable by Physics; Biology embraces phenomena which are not explicable by Chemistry; and no biological generalization will enable us to predict the infinite specialities produced by the complexity of vital conditions. So Social Science, while it has departments which in their fundamental generality correspond to mathematics and physics, namely, those grand and simple generalizations which trace out the inevitable march of the human race as a whole, and, as a ramification of these, the laws of economical science, has also, in the departments of government and jurisprudence, which embrace the conditions of social life in all their complexity, what may be called its Biology, carrying us on to innumerable special phenomena which outlie the sphere of science, and belong to Natural History. And just as the most thorough acquaintance with physics, or chemistry, or general physiology, will not enable you at once to establish the balance of life in your private vivarium, so that your particular society of zoophytes, mollusks, and echinoderms may feel themselves, as the Germans say, at ease in their skin; so the most complete equipment of theory will not enable a statesman or a political and social reformer to adjust his measures wisely, in the absence of a special acquaintance with the section of society for which he legislates, with the peculiar characteristics of the nation, the province, the class whose well-being he has to consult. In other words, a wise social policy must be based not simply on abstract social science, but on the natural history of social bodies.