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A DETAIIJED discussion of the present state of the question of electric convection has been recently given in an article by Cremieu in the December number of the Journal de Physique. Contradictory results have been obtained, some seeming to prove the existence of a magnetic field around a moving charged body, others seeming to prove the non-existence of such an effect.In the same article the conditions necessary for a proper experiment on electric convection have been clearly set forth.We shall recall that the realization of the following conditions is imperative :i. That the chaige is actually carried along -entrainee-by the body in motion.2. That only this charge can act upon the apparatus destined to detect the magnetic affect attributed to its entrainement.3. That, during its entrainement, the charge undergoes no variation ; in particular, that the loss by leakage is limited to a very small fraction of the total charge carried.In the hope of reconciling the contradictory results obtained by the various experimenters on this question of fundamental importance, M. H. Poincare took the initiative in the fall of 1902 to bring about a collaboration between two of the experimenters whose results have invariably been in contradiction one to the other. In 1 Communicated to the Societe francaise de Physique seance du lj Avril, 1903.

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