s. 2, 11, 12). But how can a person tell whether, for example, the great discovery was made, the two celebrated vertebrx discovered over a hundred new species of extinct verte- ratio was 5:6 = 11, or 4:7 = 11? By thissimplerule: brates, most of them from two newly discovered ter- The lesser number… … Fig. 20.—LET-OFF CAUSING NEEDLE AND PLATE TO MOVE IN OPPOSITE DIRECTIONS. Fig. 18.—LET-OFF MECHANISM. first known American pterodactyls, two new orders of of the Eosaurus acadianus, the earliest fossil example in the figure, as may easily be verified in Figs. 2, 6, 8, large mammals of elephantine…
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