Russell, S. B. (1921). The Evolution of Nerve Muscle Mechanisms. Journal of Comparative Psychology, 1(5), 395-412.
http://dx.doi.org/10.1037/h0073100
In a highly speculative story of the origin and development of neuromuscular mechanisms in living organisms, the author makes plenteous use of analogies gathered from many sources, notably from chemistry, physics, and mechanics, and not infrequently from the domains of the household. The concepts used relate to carbon and oxygen union, energy, energy discharge (explosion), intermittency of explosion after the fashion of gasoline engines, outer and inner zones of matter in the organism (the outer two becoming the sensory and motor zones and the inner one becoming the central nervous system), walls and check walls, the perforated burner of the home gas cook stove, "signal" lines, line junctions, "guard" junctions, "association" lines, signal centers, and head centers. A diagram is presented to schematize and clarify what the author is talking about. From Psych Bulletin 19:12:00921. (PsycINFO Database Record (c) 2016 APA, all rights reserved)