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researches on, 4


(scan of this plate no longer shown)
Plate 12, Chart IV
spectra 1-18 (Myohaematin in molluscs, &c.)
illustrating C. A. Mac Munn, M.A., M.D., “Researches on Myohaematin and the Histohaematins.” Communicated by Professor M. Forster, Sec. R.S.; Received October 19,—Read November 26, 1885. Philosophical Transactions 177 (1886): 267-298
Stanford University copy, no date of digitization.

Specimens exhibited on Charts I-IV discussed pp 296-298

It appears that Mac Munn isolated what are now called cytochromes — he was interested in them as colouring matter — and that their functions became apparent much later. His research involved examination of tissue, compressed to any required thickness, through a binocular microscope; “Observations were frequently checked (and measurements made in wave-lengths) by bringing the object in the compressorium before the slit of a large one-prism chemical spectroscope.” (p267)

23 July 2013

tags: cytochromes; C. A. Mac Mun, “Researches” (1886)