On the behaviour of oxy-hæmoglobin, carbonic-oxide-hæmoglobin, methæmoglobin, and certain of their derivatives, in the magnetic field, with a preliminary note on the electrolysis of the hæmoglobin compounds

In the course of his investigations on magnetism and diamagnetism, read before the Royal Society in the year 1845, Faraday found that, notwithstanding the iron which its colouring matter contains, the blood is a diamagnetic liquid.