of progress； combined to produce the idea of an organic development； in which the historian has to determine the central principle or leading character。 This is illustrated by the apotheosis of democracy in Tocqueville's 〃Democratie en Amerique〃； where the theory is maintained that 〃the gradual and progressive development of equality is at once the past and the future of the history of men。〃 The same two principles are combined in the doctrine of Spencer （who held that society is an organism； though he also contemplated its being what he calls a 〃super…organic aggregate〃） （A society presents suggestive analogies with an organism； but it certainly is not an organism； and sociologists who draw inferences from the assumption of its organic nature must fall into error。 A vital organism and a society are radically distinguished by the fact that the individual components of the former； namely the cells； are morphologically as well as functionally differentiated； whereas the individuals which compose a society are morphologically homogeneous and only functionally differentiated。 The resemblances and the differences are worked out in E。 de Majewski's striking book 〃La Science de la Civilisation〃； Paris； 1908。）； that social evolution is a progressive change from militarism to industrialism。
7。 the idea of development assumed another form in the speculations of German idealism。 Hegel conceived the successive periods of history as corresponding to the ascending phases or ideas in the self…evolution of his Absolute Being。 His 〃Lectures on the Philosophy of History〃 were published in 1837 after his death。 His philosophy had a considerable effect； direct and indirect； on the treatment of history by historians； and although he was superficial and unscientific himself in dealing with historical phenomena； he contributed much towards making the idea of historical development familiar。 Ranke was influenced； if not by Hegel himself； at least by the Idealistic philosophies of which Hegel's was the greatest。 He was inclined to conceive the stages in the process of history as marked by incarnations； as it were； of ideas； and sometimes speaks as if the ideas were independent forces； with hands and feet。 But while Hegel determined his ideas by a priori logic； Ranke obtained his by inductionby a strict investigation of the phenomena； so that he was scientific in his method and work； and was influenced by Hegelian prepossessions only in the kind of significance which he was disposed to ascribe to his results。 It is to be noted that the theory of Hegel implied a judgment of value； the movement was a progress towards perfection。
8。 In France； Comte approached the subject from a different side； and exercised； outside Germany； a far wider influence than Hegel。 The 4th volume of his 〃Cours de philosophie positive〃； which appeared in 1839； created sociology and treated history as a part of this new science； namely as 〃social dynamics。〃 Comte sought the key for unfolding historical development； in what he called the social…psychological point of view； and he worked out the two ideas which had been enunciated by Condorcet： that the historian's attention should be directed not； as hitherto； principally to eminent individuals； but to the collective behaviour of the masses； as being the most important element in the process； and that； as in nature； so in history； there are general laws； necessary and constant； which condition the development。 The two points are intimately connected； for it is only when the masses are moved into the foreground that regularity； uniformity； and law can be conceived as applicable。 To determine the social… psychological laws which have controlled the development is； according to Comte； the task of sociologists and historians。
9。 The hypothesis of general laws operative in history was carried further in a book which appeared in England twenty years later and exercised an influence in Europe far beyond its intrinsic merit； Buckle's 〃History of Civilisation in England〃 （1857…61）。 Buckle owed much to Comte； and followed him； or rather outdid him； in regarding intellect as the most important factor conditioning the upward development of man； so that progress； according to him； consisted in the victory of the intellectual over the moral laws。
10。 The tendency of Comte and Buckle to assimilate history to the sciences of nature by reducing it to general 〃laws；〃 derived stimulus and plausibility from the vista offered by the study of statistics； in which the Belgian Quetelet； whose book 〃Sur l'homme〃 appeared in 1835； discerned endless possibilities。 The astonishing uniformities which statistical inquiry disclosed led to the belief that it was only a question of collecting a sufficient amount of statistical material； to enable us to predict how a given social group will act in a particular case。 Bourdeau； a disciple of this school； looks forward to the time when historical science will become entirely quantitative。 The actions of prominent individuals； which are generally considered to have altered or determined the course of things； are obviously not amenable to statistical computation or explicable by general laws。 Thinkers like Buckle sought to minimise their importance or explain them away。
11。 These indications may suffice to show that the new efforts to interpret history which marked the first half of the nineteenth century were governed by conceptions closely related to those which were current in the field of natural science and which resulted in the doctrine of evolution。 The genetic principle； progressive development； general laws； the significance of time； the conception of society as an organic aggregate； the metaphysical theory of history as the self…evolution of spirit；all these ideas show that historical inquiry had been advancing independently on somewhat parallel lines to the sciences of nature。 It was necessary to bring this out in order to appreciate the influence of Darwinism。
12。 In the course of the dozen years which elapsed between the appearances of 〃The Origin of Species〃 （observe that the first volume of Buckle's work was published just two years before） and of 〃The Descent of Man〃 （1871）； the hypothesis of Lamarck that man is the co…descendant with other species of some lower extinct form was admitted to have been raised to the rank of an established fact by most thinkers whose brains were not working under the constraint of theological authority。
One important effect of the discovery of this fact （I am not speaking now of the Darwinian explanation） was to assign to history a definite place in the coordinated whole of knowledge； and relate it more closely to other sciences。 It had indeed a defined logical place in systems such as Hegel's and Comte's； but Darwinism certified its standing convincingly and without more ado。 The prevailing doctrine that man was created ex abrupto had placed history in an isolated position； disconnected with the sciences of nature。 Anthropology； which deals with the animal anthropos； now comes into line with zoology； and brings it into relation with history。 （It is to be observed that history is （not only different in scope but） not coextensive with anthropology IN TIME。 For it deals only with the development of man in societies； whereas anthropology includes in its definition the proto…anthropic period when anthropos was still non…social； whether he lived in herds like the chimpanzee； or alone like the male ourang…outang。 （It has been well shown by Majewski that congregations herds； flocks； packs； etc。of animals are not SOCIETIES； the characteristic of a society is differentiation of function。 Bee hives； ant hills； may be called quasi…societies； but in their case the classes which perform distinct functions are morphologically different。） Man's condition at the present day is the result of a series of transformations； going back to the most primitive phase of society； which is the ideal （unattainable） beginning of history。 But that beginning had emerged without any breach of continuity from a development which carries us back to a quadrimane ancestor； still further back （according to Darwin's conjecture） to a marine animal of the ascidian type； and then through remoter periods to the lowest form of organism。 It is essential in this theory that though links have been lost there was no break in the gradual development； and this conception of a continuous progress in the evolution of life； resulting in the appearance of uncivilised Anthropos； helped to reinforce； and increase a belief in； the conception of the history of civilised Anthropos as itself also a continuous progressive development。
13。 Thus the diffusion of the Darwinian theory of the origin of man； by emphasising the idea of continuity and breaking down the barriers between the human and animal kingdoms； has had an important effect in establishing the position of history among the sciences which deal with telluric development。 The perspective of history is merged in a larger perspective of development。 As one of the objects of biology is to find the exact steps in the genealogy of man from the lowest organic form； so the scope of history is to determine the stages in the unique causal series from the most rudimentary to the present state of human civilisation。
It is to be observed that the interest in historical research implied by this conception need not be that of Comte。 In the Positive Philosophy history is part of sociology； the interest in it is to discover the sociological laws。 In the view of which I have just spoken； history is permitted to be an end in itself； the reconstruction of the genetic process is an independent interest。 For the purpose of the reconstruction； sociology； as well as physical geography； biology； psychology； is necessary； the sociologist and the historian play into each other's hands； but the object of the former is to establish generalisations； the aim of the latter is to trace in detail a singular causal sequence。
14。 The success of the evolutional theory helped to discredit the assumption or at least the invocation of transcendent causes。 Philosophically of course it is compatible with theism； but historians have for the most part desi