SUMMAHY. [XXIJ 



conditions of a primitive age, or in other words, the primitive fluid state 

 of the rotating mass and its consolidation into a terrestrial spheroid. 

 Measurements of degrees and pendulum experiments in different lati- 

 tudes. Compression. The figure of the earth was known to Newton on 

 theoretical grounds, and the force discovered, of the operation of 

 which the laws of Kepler are a necessary consequence. The discovery 

 of such a force, whose existence is developed in Newton's imperishable 

 work Principia, was nearly simultaneous with the opening of new 

 paths to mathematical discovery by the invention of the infinitesimal 

 calculus pp. 714-737. 



VIII. Retrospect, multiplicity, and intimate connection existing 

 among the scientific efforts of modern times. Ketrospect of the principal 

 momenta in the history of cosmical contemplation connected with great 

 events. The multiplicity of the links of connection among the different 

 branches of science in the present day increases the difficulty of separa- 

 ting and limiting the individual portions Intellectual activity hence- 

 forth produces great results almost without any external incitement, 

 and by its own internal power manifested in every direction. The 

 history of the physical sciences gradually fuses into that of the idea of 

 Universal Nature pp. 738-741. 



VOL. II. *2 B 



