ty of 1870 But how can a person tell whether, for example, the great discovery was made, the two celebrated vertebrae discovered over a hundred new species of extinct verte- ratio was 5:6 = 11, or 4:7 — 11 ? By this simple rule : 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. 19—METHOD OF PLOTTING THE FIGURES. 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.…
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