Independent Inventions Neither Parallel Nor Diffused
It will be some years before the debate of diffusion versus independent invention comes anywhere near settlement. Much of Gladwin’s evidence for diffusion is striking and not to be laughed aside—particularly the group of Australian traits in our Southwest, and the Polynesian and Melanesian traits in the area around the Gulf of Darien. His injection of Old World voyagers between the northern and southern areas of the New World explains certain puzzling matters; but the theory presents puzzles of its own. Many culture traits of Middle America and Peru are not found in Oceania: the use of cement in masonry and the vigesimal system of numeration in Middle America; the amazingly intricate Maya calendar and hieroglyphics with the first invention of zero; baked brick in two Mexican sites; bronze in Peru; the hammock; the whistling jar; the manioc press. Some of these New World traits must have been invented here, but we are asked to believe that the others were forgotten in Oceania and remembered in the Americas. One argument for trans-Pacific diffusion is clear and cogent, however. It is hard to believe that the men who voyaged as far as the Marquesas and Easter Island stopped there, and so missed our long coast line. Certainly the sweet potato made the ocean crossing in the reverse direction, but was it before Columbus?[18]
Other things went with the sweet potato, according to the great chemist Gilbert N. Lewis. Without believing that man originated in South America, he thinks that man first reached the neolithic level in the area east of the Peruvian Andes while his fellow man in the rest of the world was wandering in paleolithic darkness. In the Andean highlands, man developed architecture, numeration, metallurgy, weaving, sculpture, and so forth. He spread these things to Middle America 6,000 or 8,000 years ago, and then carried them across the Pacific to the Old World.[19] As a whole, Lewis’s theory may be unacceptable; but his arguments for diffusion and against independent invention are persuasive.
In 1947 six Scandinavians demonstrated the possibility of an east-west crossing by sailing and drifting 4,300 miles in 101 days on a primitive raft of balsa logs from Peru to an atoll not many days from Tahiti.[20]
The position of the American partisans of independent invention is a curious one. It is both weak and strong. Man is inventive—even primitive man. But his inventions often have a unique quality: they are not always duplicated, or they are not duplicated at the same level of cultural development. Consider the cave paintings and the sculpture of the Aurignacians, Solutreans, and Magdalenians in the late Paleolithic. It is an art of remarkable perfection that utterly disappeared, and was not equaled again for thousands upon thousands of years. At Bonampak, in southern Mexico, a Maya painter used consummate perspective and foreshortening long before they appeared in Asia. Then there are the unique Folsom point, the perfection of the Solutrean and Eden points, the Maya calendar and hieroglyphs, the mosaic walls of Mitla in Mexico, Egyptian architecture and sculpture as well as writing, the beautifully expressive masks of the African Negro, the Melanesian, and the Eskimo. These were independent inventions, but they were unique ones. They were not independent, parallel inventions. And they were not diffused.
As for early man in the New World, we may believe if we wish that the shape of the Sandia point was diffused from the Solutreans of Europe. We may deny the independent invention in our Southwest of spear-throwers, bull-roarers, bunt points, and curved throwing sticks that look more as if they had been brought from Australia. The Eden point may have come from Siberia, or Siberia may have got it from North America. The Folsom point, however, looks definitely like an independent invention, for it is found nowhere else in the world. This argues that the people who ultimately succeeded in making it must have been in the New World for many, many generations before one of them lashed a Folsom point to a spear and thrust it into a bison. Where are the flints they shaped before the Sandia, Clovis, and Folsom? Can they have evolved the craft of flint knapping here in the New World? When we know this, we shall probably know whether they came before or after the last glaciers.