t'UMMAKY. ' L XX * 



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

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

 M easuremerits of degrees and pendulum experiments in different lati- 

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

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

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

 >f 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. Retrospect 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 f-aecfl into that of tlio idoa of 

 laivrcraal Nature \ p. 738-741. 



VOL. II. 



