THE DAWN OF LIFE 151 



masses of Eozoon, without regard to the direction of 

 their laminae, though sometimes they run parallel to 

 the structure, the rock having broken more easily in 

 that direction. 



Bearing in mind these general points of material 

 form and appearance, we may now proceed to in- 

 quire as to the following points : (i) The structures 

 visible in the specimens ; (2) The manner ifi ivIiicJi 

 they are represented by dijferent mineral substances, 

 and hozv these are to be accounted for ; (3) The ex- 

 planation of the whole on the supposition that we are 

 dealing with an animal fossil. 



(i) In regard to the first of these questions, I 

 may quote here, with some slight alteration, from a 

 recent memoir of my own : ^ — 



In recent years I have been disposed to attach 

 more importance than formerly to the general form 

 of Eozoon. The earlier examples studied were, for 

 the most part, imbedded in the limestone in such a 

 manner as to give little definite information as to 

 external form ; and at a later date, when Sir William 

 Logan employed one of his assistants, Mr. Lowe, to 

 quarry large specimens at Grenville and Cote St. 



* London Geological Magazine, 1895. 



