No opponent of diffusionism is so blind as to deny the importation of some culture traits by the migrants from northern Asia. Kroeber concedes the fire drill, the spear-thrower, stone chipping, twisting of string, the bow, the throwing harpoon, simple basketry and nets, hunting complexes, cooking stones in vessels of wood, of bark, or of skin, body painting and perhaps tattooing, the domestication of dogs.[12] But, except for these and a few other examples, most anthropologists deny that the American Indians, early or late, brought any objects of their culture from the Old World. Alfred V. Kidder has phrased very neatly their antagonism to “non-stop journeys by bag-and-baggage culture carriers.”[13] This phrase is aimed at a weak chink in the diffusionist’s armor—the fact that Old World traits found, say, in the Southwest, Middle America, or farther south leave no trail across Alaska and down through Canada and over the Great Plains. In addition, the opponents of diffusion like to point out that certain things in the Indian culture of the northern part of the New World are like certain things in the Indian culture of the southern part, while in between lies a very large area—Middle America and Peru—of entirely different culture traits. Here we find none of the northern and southern things. Nordenskiöld observes that, while some of the identical northern and southern traits may be due to the stimulus of similar cold climates, there are numerous traits that have nothing to do with temperature and humidity. He doubtless feels he is delivering the coup de grâce when he writes: It is a very characteristic fact that incomparably greater similarity exists between civilizations as far apart as those of the Calchaquis of Argentina, and the Pueblos of North America, than between the culture of any Indian tribe and that of any people in the whole of Oceania.[14] If such traits were diffused from one American area to the other, they left no trace between. When we add this to the fact that from Alaska to Middle America there are no traces of even the simplest beginnings of the cultures of the central area, the advocate of independent invention has a pretty good case. In answer, the diffusionist has been tempted to argue that when men are moving rather steadily across an area, they do not leave evidence that is easy to find some millenniums later. Only a hundred years have passed since Brigham Young led his people from Independence, Missouri, to Salt Lake City, and yet there is a singular paucity of spinning wheels and first editions of _The Book of Mormon_ along their trail. The Trap of Time Gladwin has a better answer, which is also an attack on a basic weakness of his opponents. Through many years he has been pointing out that friends of the inventive Indian have been getting squeezed tighter and tighter in a trap of their own independent invention. It is the trap of time.