[4] I do not mean to affirm here in a positive manner the transmutability of bodies, or to point it out as a subject for investigation; still less do I pretend to say what ought to be the opinion of savants upon this point. I wish only to call attention to the species of scepticism generated in every uninformed mind by the most general conclusions of chemical philosophy, or, better, by the irreconcilable hypotheses which serve as the basis of its theories. Chemistry is truly the despair of reason: on all sides it mingles with the fanciful; and the more knowledge of it we gain by experience, the more it envelops itself in impenetrable mysteries. This thought was recently suggested to me by reading M. Liebig's "Letters on Chemistry" (Paris, Masgana, 1845, translation of Bertet-Dupiney and Dubreuil Helion). Thus M. Liebig, after having banished from science hypothetical causes and all the entities admitted by the ancients,--such as the creative power of matter, the horror of a vacuum, the esprit recteur, etc. (p. 22),--admits immediately, as necessary to the comprehension of chemical phenomena, a series of entities no less obscure,--vital force, chemical force, electric force, the force of attraction, etc. (pp. 146, 149). One might call it a realization of the properties of bodies, in imitation of the psychologists' realization of the faculties of the soul under the names liberty, imagination, memory, etc. Why not keep to the elements? Why, if the atoms have weight of their own, as M. Liebig appears to believe, may they not also have electricity and life of their own? Curious thing! the phenomena of matter, like those of mind, become intelligible only by supposing them to be produced by unintelligible forces and governed by contradictory laws: such is the inference to be drawn from every page of M. Liebig's book. Matter, according to M. Liebig, is essentially inert and entirely destitute of spontaneous activity (p. 148): why, then, do the atoms have weight? Is not the weight inherent in atoms the real, eternal, and spontaneous motion of matter? And that which we chance to regard as rest,--may it not be equilibrium rather? Why, then, suppose now an inertia which definitions contradict, now an external potentiality which nothing proves? Atoms having WEIGHT, M. Liebig infers that they are INDIVISIBLE (p. 58). What logic! Weight is only force, that is, a thing hidden from the senses, whose phenomena alone are perceptible,--a thing, consequently, to which the idea of division and indivision is inapplicable; and from the presence of this force, from the hypothesis of an indeterminate and immaterial entity, is inferred an indivisible material existence!