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POPULAR SCIENCE MONTHLY.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8e/PSM_V67_D474_Chart_of_sequioa_size_in_each_geologic_period.png/540px-PSM_V67_D474_Chart_of_sequioa_size_in_each_geologic_period.png)
Fig. 4. Section showing Progress of Animal Life during which Sequoias have Flourished, upper space shows compatible sections of a trunk of a modern tree.
These restorations which are after Chas. R. Knight's drawings are used with the kind permission of Professor Henry Fairfield Osborn of the American Museum of Natural History.