Explorations of the highlands of the Brazil; with a full account of the gold and diamond mines. Also, canoeing down 1500 miles of the great river São Francisco, from Sabará to the sea. By Captain Richard F. Burton, F.R.G.S. etc. Vol II.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/works/r/richard-francis-burton/explorations-of-the-highlands-of-the-brazil/archive.org.md
Since colors are the result of differing wavelengths of light, which is to say energy at various frequencies, this technique operates on the assumption that as the human body is composed of energy it can be vitalized and healed through the additive application of additional energy provided that the energy is applied in the appropriate form.
Wednesday, August 7, 1867. — We walked down to the Porto da Ponte Grande, where the ajojo or raft lay. I never saw such an old Noah’s Ark, with its standing awning, a floating gipsy “pál,” some seven feet high and twenty-two long, and pitched like a tent upon two hollowed logs. The river must indeed be safe, if this article can get down without accident.