8 The Stone Quarry. 



dence for our study of these facts varies all 

 the way from the vague conviction of the 

 quarryman's judgment to the convictions that 

 are founded on the closest scrutiny of the 

 facts by men whose whole lives are devoted 

 to the study of just such things with all the 

 skilled culture of the age to help them. In 

 addition, then, to the quarryman's conviction, 

 we have skilled students of science testifying 

 that they find in these very stone quarries 

 the materials for the exact study of plant and 

 animal life. So complete are these materials 

 that they satisfy all inquiry, and produce a 

 conviction that in prying apart the stone lay- 

 ers of the rocks the scientist is in reality open- 

 ing the leaves of the past history of our world, 

 and that in these buried leaves of sand stone 

 and mud deposits of seas and lakes of former 

 ages, he is uncovering not only the real shells 

 and bones of the life of the period, but even 

 the ripple marks of the waters that once cov- 

 ered them. 



On Plate I we have a very good engraving 

 from a photograph of one of these rock frag- 



