Charles Darwin focused his attention in 'On the Origin of Species' (1859) on observations and conclusions about lower life forms (plants, insects, fish, birds, amphibians, reptiles, and mammals, not humans). Darwin wanted to focus his readers' attention on the order, simplicity, and beauty of his Hypotheses about the Evolution of Life. He wanted to avoid distracting his readers, so in this first book, he limited his discussions regarding man and human higher faculties. Darwin deferred publishing his ‘human series’, 'The Descent of Man, and Selection in Relation to Sex' until 1871, and 'The Expression of the Emotions in Man and Animals' until 1872, largely to avoid debates regarding creationism and abolitionism.
Even though he was educated as both a physician (University of Edinburgh) and theologian (Cambridge University), Darwin, the naturalist, did not want to debate whether there was a Creator and a Divine plan. He thought those were distinct issues from his attempts to observe and describe natural laws. Darwin did not deny or support Deism, but as a scientist, he thought unifying hypotheses could be discovered that did not require the intervention of religion for many difficult questions. In his Introduction to 'The Expression of the Emotions in Man and Animals', Darwin scholar Joe Cain, tells readers that some of Darwin’s peers and reviewers had adopted a ‘middle ground’ or compromise position between evolution and creationism - perhaps the human body had evolved, but there were limits to evolution when it came to the mind, intelligence, and morality. Cain cites Charles Lyell ('Principles of Geology' – 1830-33) as an important ‘middle-grounder’ in that he supported the ideas that the earth was ancient (created over a longer time frame than seven days), and that scientists could seek uniform and constant laws (hypotheses). Cain also notes the work of Alfred Russell Wallace, a naturalist who thought evolution governed nature, but it had ‘limits’, and needed Divinity to explain the ‘higher human faculties’ of reason and morality.
Darwin also did not wish to have his evolutionary theory mired in racial issues that were being argued during the Victorian era of Imperialism. He argued that all human species were one race (monogenism) as opposed to different separate species (polygenism) – based on the biological definition of distinct species - all members of the same species can interbreed, and all human races could interbreed.
Darwin had hypothesized that the evolutionary differences between animals and man were of degree, not of kind, in 'On the Origin of Species'. He employed the same three-step strategy in both 'The Descent of Man, and Selection in Relation to Sex', and 'The Expression of the Emotions in Man and Animals' -
• Observe human-like qualities in animals
• Identify primeval examples in humans
• Narrow the differences between animals and man.
In 'The Expression of Emotions in Man and Animals' (1872), Darwin described the emergence (origin, descent) of consciousness and communication. He made systematic observations of nonverbal communication of feelings or emotions, in both animals and man. He delved into the origins of language and ideas like morality and immorality, fairness and injustice, selfishness versus altruism, and the importance of these ideas in fostering collaboration via reciprocal altruism. Darwin’s three specific purposes in publishing 'The Expression of the Emotions in Man and Animals' were:
• Describe the chief expressive actions of man, emphasizing habitual and involuntary means of expression,
• Describe the expressions with specific reference to the muscles and nerves (mostly in the face and eyes) used to produce these expressions of emotions, and
• Elucidate Principles (Hypotheses) that might get at the cause of these expressions.
Darwin gathered an immense quantity of observational data from a variety of different sources “… to ascertain how far particular movements of the features and gesture are really expressive of states of the mind” -
• Observing infants – Darwin’s own children and others
• Pictures of suffering patients in insane asylums
• Paintings and sculptural examples of human expression
• Pictures from French neurologist, Guillaume Duchenne, who used electric shocks (galvanization) to elicit expressions by shocking different facial and orbital muscles one at a time or in combinations
• Queries sent to naturalists, missionaries, and explorers around the world
• Observations of animals in the zoo and domesticated animals
• Photographs of humans and animals – prolonged exposure times in photographic equipment of that era meant maintaining expressions long enough for a photograph to be acquired. Darwin’s book was one of the first books to include illustrative photographs.
Darwin sought the assistance of naturalists, explorers, and missionaries from around the world. He sent the following questions to observers of human populations (races, tribes, and cultures), and he acknowledged by name many who provided him with data. (listed in his Introduction):
1. Is astonishment expressed by the eyes and mouth being opened wide and the eyebrows being raised?
2. Does shame excite a blush when the skin color allows one to observe a blush? How far down the body does the blush extend?
3. When a man is indignant or defiant, does he frown, hold his body and head erect, square his shoulders, and clench his fists?
4. When considering deeply on a subject, or trying to understand a puzzle, does he frown, or wrinkle the skin below his eyelids?
5. When in low spirits, are the corners of the mouth depressed, and the inner corner of the eyelids raised by the muscle the French call the ‘grief muscle’? – The eyebrow in this state becomes slightly oblique, with a little swelling at the inner end, and the forehead is transversely wrinkled in the middle part, but not across the whole breadth as when the eyebrows are raised in surprise.
6. When in good spirits, do the eyes sparkle, with the skin a little wrinkled around and under them, and with the mouth a little drawn back at the corners?
7. When a man sneers or snarls at another, is the corner of the upper lip over the canine or eye tooth raised on the side facing the man whom he addresses?
8. Can a dogged or obstinate expression be recognized, which is chiefly recognized by the mouth being firmly closed, a lowering brow, and a slight frown?
9. Is contempt expressed by a slight protrusion of the lips, and by turning up the nose with slight expiration?
10. Is disgust shown by the lower lip turned down, the upper lip slightly raised, with a sudden expiration, something like incipient vomiting, or like something to spit out of the mouth?
11. Is extreme fear expressed in the same general manner as with Europeans?
12. Is laughter ever carried to the extreme as to bring tears to the eyes?
13. When a man wishes to show that he cannot prevent something being done, or cannot himself do something (helplessness), does he shrug his shoulders, turn inward his elbows, extend outward his hands and open the palms, with the eyebrows raised?
14. Do the children when sulky, pout or greatly protrude their lips?
15. Can guilty, sly, or jealous expressions be recognized?
16. Is the head nodded vertically in affirmation, and shaken laterally in negation?
From these diverse types of evidence, Darwin laid out three principles of human expression of emotions:
• Movements which are voluntarily performed in the pursuit of some definite objective (serviceable in gratifying some desire) are often repeated until they become Habits;
• Antithesis – if certain actions become habitual in expressing an emotion, the opposite emotion is likely to be expressed with an opposite action (nodding affirmation up and down versus signaling negation by side to side head nodding;
• Direct action of the nervous system (reflex) can be independent of will and habit; for example, closing the eyes with a sudden sneeze.
Darwin emphasized the finding of similar expressions among a wide variety of humans from all over the world. He felt this provided support for the ‘unity of human race’, and the innate origins of expressions, such as joining uplifted hands as if in prayer or giving thanks; kissing as a mark of affection; and shrugging the shoulders as a sign of impotence or helplessness.
Darwin did not try to answer every question, and he acknowledged his limitations and errors. I agree with Joe Cain, who wrote in his Introduction to 'The Expression of the Emotions in Man and Animals', that Darwin’s books are not meant to be read straight through. They are encyclopedic collections of observations to be used primarily as a reference. However, 'The Expression of the Emotions in Man and Animals' is much more than a textbook. I learned a lot, particularly by staring at the illustrations of humans and animals expressing their feelings. I strongly recommend 'The Expression of the Emotions in Man and Animals'.
After a lifetime of study and three amazing books, Charles Darwin did not leave me shrugging my shoulders, blushing, pouting, clenching my fists, or snarling. Rather, he brought a smile to my face and a twinkle to my eyes.