200 THE MATHEMATICAL THEORIES OF THE EARTH. 



iiiid the freost avonnes for tlie disseniination of new information; so 

 that we may easily gain the advantage of a concentration of energy 

 without centralization of personal interests. To those, therefore, who 

 can bring the i)re-re(iiiisites of endless patience and unliagging industry, 

 who can bear alike the remorseless discipline of repeated faiinre and 

 the prosperity of partial success, the field is as wide and as inviting as 

 it ever was to a Newton or a Laplace. 



