On the spectrum of bile : a paper read before the New York Academy of Medicine, January 8, 1874
A medical paper on the spectrum of bile, read before the New York Academy of Medicine in 1874 by physician John Call Dalton and published in New York by D. Appleton and Company for a professional medical audience. Its pictures are plain black-and-white spectroscope diagrams: rows of bands labelled A through H over the colours from red to violet, with dark absorption bands and shaded fields that a designer could use for scientific charts or diagram layouts.
