Scientific Serials

Abstract

Moniteur Scientifique, February I.—In this number M. Emile Kopp gives an account of Weldon's well-known process for the regeneration of “manganese.” In a note on the Infinitesimal Calculus, M. Néhay maintains that neither the infinitely great nor the infinitely small can be considered as real quantities; that the algebraical relations established in the calculus for such quantities depend solely on the conservation of certain ratios and not on any particular unit, and are hence true for magnitudes as great or as small as we please; and that infinitesimals can always be exchanged for finite proportionals. Bolley finds on analysis that the artificial alizarine of Meister, Lucius, and Co. has very exactly the formula C₁₄H₈O₄.