. Bulletin international de l'Académie des Sciences de Cracovie. Classe des sciences mathématiques et naturelles. = Anzeiger der Akadémie der Wissenschaften in Krakau. Mathematisch-naturwissenschaftliche classe. Science. 226 the absorption spectruni of solutions obtained by treating tbe three porphyrins witii broniinc in tbe nianner described bv Mr. Scluinck and myself '). C J a ^. !.. iil]yllopor[il]yrm + Br 2., mesoporphyrin + Br H., haematoporphyrin 4- Br The stated properties of mesoporphyrin may be taken as a proof of the contention, previously , that by reinoving hydroxyls grad
. Bulletin international de l'Académie des Sciences de Cracovie. Classe des sciences mathématiques et naturelles. = Anzeiger der Akadémie der Wissenschaften in Krakau. Mathematisch-naturwissenschaftliche classe. Science. 226 the absorption spectruni of solutions obtained by treating tbe three porphyrins witii broniinc in tbe nianner described bv Mr. Scluinck and myself '). C J a ^. !.. iil]yllopor[il]yrm + Br 2., mesoporphyrin + Br H., haematoporphyrin 4- Br The stated properties of mesoporphyrin may be taken as a proof of the contention, previously , that by reinoving hydroxyls gradually from tlie molécule of haematoporphyrin and substituting hydro;^en \ve shall in the end obtain phylloporphyrin. The electrolytic dissociation o f haem atop or phy- rin salts. By a method identical with the one used in the case of phylloporphyrin salts-), it is possible to show that haematoporphyrin salts dissociate ellectrolytically in aqueous solutions. Haematopor- phyrin is a weaker base than phylloporphyrin and, in order to pre- vent hydrolytic dissociation, it is necessary to apply solutions con- taining a greater excess of free acids than in the former case. The reproduction of photographs on plate II show that the absorp- tion spectra are identical, no matter what acid bas been used to neutralise the colouring- matter. ') tlourn. cheiii. Suciety, London 190Ü, p. 1091. ^1 Bull. Intern, de l'Académie des Sciences de Cracovie, Classe des Scien- ces mathématiques et naturelles«, 1902, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Polska Akademia Umiejtnoci. Wydzia Matematyczno-Przyrodniczy. Cracovie : Impr. de l'Université
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