64 JoLY — An Estimate of the Geological Age of the Earth. 



account our uncertainty in many particulars attending these corrections, and as 

 to the constancy throughout the past of solvent denudation, and bearing in mind 

 that any approximation to a correction for marine denudation must be attended 

 with this same micertainty, but that the latter correction will undoubtedly be 

 subtractive, we think that it is at least justifiable to claim that our present 

 knoivledgc of solvent-denudation of the EartKs surface points to a period of between eighty 

 and ninety millions of years having elapsed since water condensed upon the Earth, and rain 

 and rivers and the actions continually progressing in the soils began to supply the 

 ocean with materials dissolved from the rocks. 



COEEiaENDA. 



Pages 34 & 35 — Note in reference to the calculation respecting the neutralisation of free hydrochloric acid : — 

 The effect of the aluminium should also be taken into account. This would reduce the 



estimated percentage of acid neutralised in the formation of sodium chloride, and so raise somewhat 



the estimate of geological time. 



The margin of error assumed in the final estimate of geological time must, however, cover the 



oversight, but leaving the balance of probabilities in favour of a duration more nearly 90 than 80 



millions of years. 



Page 61, third line from top— /or ErdstoUen read Erbstollen. 

 Page 66, eighth line from top— /or part read past. 



