MacMunn pioneered the use of spectroscopy in medicine, devoting the present work-- his first book--to a discussion of the spectroscope and its use in medical analysis. MacMunn would go on to investigate the spectra of heme proteins in different states of oxygenation, discovering the pigments now known as cytochromes; MacMunn's findings were discredited by German physiologist Hoppe-Seyler, and MacMunn's contributions to hematology remained unrecognized until Keilin's rediscovery of cytochromes in 1925. -Garrison-Morton.com 13108, 13109.