178 THE DAWN OF LIFE. 



and in Palgeozoic crinoids and corals filled with other 

 hydrous silicates. 



5. The type of growth and structure predicated of 

 Eozoon from the observed appearances^ in its great 

 size^ its laminated and acervuline forms, and in its 

 canal system and tubulation, are not only in con- 

 formity with those of other Foraminifera, but such as 

 might be expected in a very ancient form of that 

 group. 



6. Indications exist of other organic bodies in the 

 limestones containing Eozoon, and also of the Eozoon 

 being preserved not only in reefs but in drifted frag- 

 mental beds as in the case of modern corals. 



7. Similar organic structures have been found in 

 the Laurentian limestones of Massachusetts and New 

 York, and also in those of various parts of Europe, 

 and Dr. Giimbel has found an additional species in 

 rocks succeeding the Laurentian in age. 



8. The manner in which the structures of Eozoon 

 are affected by the faulting, development of crystals, 

 mineral veins, and other effects of disturbance and 

 metamorphism in the containing rocks, is precisely 

 that which might be expected on the supposition that 

 it is of organic origin. 



9. The exertions of several active and able op- 

 ponents have failed to show how, otherwise than by 

 organic agency, such structures as those of Eozoon 

 can be formed, except on the supposition of pseudo- 

 morphism and replacement, which must be regarded as 

 chemically extravagant, and which would equally im- 



