Such is the course to be pursued with all the sciences， and especially with the moral and political sciences. To consider in turn each distinct province of human activity， to decompose the leading notions out of which we form our conceptions， those of religion， society and government， those of utility， wealth and exchange， those of justice， right and duty. To revert to manifest facts， to first experiences， to the simple circumstances in which the elements of our ideas are included； to extricate from these the precious lode without omission or mixture； to recompose our idea with these， to define its meaning and determine its value； to substitute for the vague and vulgar notion with which we started out the precise scientific definition we arrive at， and for the impure metal we received the refined metal we recovered， constituted the prevalent method taught by the philosophers under the name of analysis， and which sums up the whole progress of the century. - Up to this point， and not farther， they are right； truth， every truth， is found in observable things， and only from these can it be derived； there is no other pathway leading to discovery.-The operation， undoubtedly， is productive only when the vein is rich， and we possess the means of extracting the ore. To obtain a just notion of government， of religion， of right， of wealth， a man must be a historian beforehand， a jurisconsult and economist， and have gathered up myriad of facts； and， besides all this， he must possess a vast erudition， an experienced and professional perspicacity. If these conditions are only partially complied with， the result will only be a half finished product or a doubtful alloy， a few rough drafts of the sciences， the rudiments of pedagogy as with Rousseau， of political economy with Quesnay， Smith， and Turgot， of linguistics with Des Brosses， and of arithmetical morals and criminal legislation with Bentham. Finally， if none of these conditions are complied with， the same efforts will， in the hands of philosophical amateurs and oratorical charlatans， undoubtedly only produce mischievous compounds and destructive explosions. - Nevertheless good procedure remains good even when ignorant and the impetuous men make a bad use of it； and if we of to day resume the abortive effort of the eighteenth century， it should be within the guidelines they set out.
_____________________________________________________________________Notes：
[1]. "Philosophi？ naturalis principia，" 1687； "Optics，" 1704.
[2] See concerning this development Comte's "Philosophie Positive，"vol. I. - At the beginning of the eighteenth century， mathematical instruments are carried to such perfection as to warrant the belief that all physical phenomena may be analyzed， light， electricity， sound， crystallization， heat， elasticity， cohesion and other effects of molecular forces. - See "Whewell's History of the Inductive Sciences. II.， III.
[3] The travels of La Condamine in Peru and of Maupertuis in Lapland.
[4] Buffon， "Théorie de la terre，" 1749； "Epoques de la Nature，"1788. - "Carte géologique de l'Auvergne，" by Desmarets， 1766.
[5] See a lecture by M. Lacaze-Duthier on Lamarck， "Revue Scientifique，" III. 276-311.