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The most brilliant and unsafe exponent of this school was Ameghino, who possessed and abused two gifts, both essential to the highest type of scientist, and both mischievous unless this scientist possess a rare and accurate habit of thought joined to industry and mastery of detail: namely, the gift of clear and interesting writing, and the gift of generalization.

Incidentally the discovery tended to show that this fauna had lasted much later in South America than was the case with the corresponding faunas in other parts of the world; and therefore it tended to disprove the claims advanced by Doctor Ameghino for the extreme age, geologically, of this fauna, and for the extreme antiquity of man on the American continent.

Ameghino rendered marked services to paleontology. But he generalized with complete recklessness from the slenderest data; and even these data he often completely misunderstood or misinterpreted.

"All around the carapace," says Ameghino, "in the reddish agglomerate of the original. soil lay charcoal cinders, burnt and split bones, and flints. Digging beneath this, a flint implement was found, with some long split llama and stag bones, which had evidently been handled by man, with some toxodon and mylodon teeth."

Ameghino gives a still more striking example of an earth-dwelling. Near Mercedes, about twenty leagues from Buenos Ayres, he picked up numerous human bones, together with arrow-heads, chisels, flint knives, bone stilettos and polishers, and bones of animals scratched and cut by man. The glyptodon.