It is this correlation between acts _distinct in themselves_ but _usually connected_ that was announced by Claude Bernard. And, _mirabile dictu_—and this is the natural outcome of the perfect sanity of mind of this great physiologist—it happens that not only Pasteur’s researches, but the development of a new science, Energetics, and Büchner’s discovery lend support to his views, and that, too, in a field where one would have thought they had no application. Le Dantec is wrong when he declares that these ideas only apply to vertebrates. “It is clear,” he says on several occasions, “that the author has in view the metazoa and even the vertebrates.” Well! no. All that is general, universally applicable, and universally true. So that there are two orders of distinct phenomena energetically opposed and certainly connected. We need only repeat Claude Bernard’s own words quoted by Le Dantec in order to confute them. _Law of Connection of Two Orders of Vital Facts._—“These phenomena [of organic destruction and of assimilating synthesis] are simultaneously produced in every living being, in a connection which cannot be broken. The disorganization or dissimilation uses up living matter [by this we must understand the reserve-stuff, as will be seen later on in the quotation] in the organs _in function_: the assimilating synthesis regenerates the tissues; it gathers together the reserve-stuff which the vital activity must expend. These two operations of destruction and renovation, inverse the one to the other, are absolutely connected and inseparable, in this sense at any rate, that destruction is the necessary condition of renovation. The phenomena of functional destruction are themselves the precursors and the instigators of material regeneration, of the formative process which is silently going on in the intimacy of the tissues. The losses are repaired as they take place; and equilibrium being re-established as soon as it tends to be broken, the body is maintained in its composition.”