FOURTH WEEK] 



November 



303 



of these came the Age of Reptiles with more than seven 

 millions of years, during all of which time the tentacles 

 of unnumbered generations of Bryozoans waved in the sea. 

 Back, back farther still we add another seven million 

 years, or thereabouts, of the Age of the Amphibians, when 

 the coal plants grew, and the Age of the Fishes. And 

 finally, beyond all exact human calculation, but estimated 



A SWAMP IN THE WOODS 



at some five million, we reach the Age of Invertebrates in 

 the Silurian, and in the lowest of these rocks we find beau- 

 tifully preserved fossils of Bryozoans, to all appearances 

 as perfect in detail of structure as these which we have 

 before us to-day in this twentieth century of man's brief 

 reckoning. 



These tiny bits of jelly are transfigured as well by the 



