94 INTRODUCTION TO SCIENCE 



Physics of the Ether, e. g. dealing with Heat, 

 Light, Electricity, Magnetism. 



Atomic Physics, e. g. Theoretical Chemistry, 

 Spectrum Analysis. 



Molecular Physics, e. g. dealing with Elasticity, 

 Sound, Crystallography, Hydro-mechan- 

 ics, Theory of the Tides, Kinetic Theory 

 of Gases. 



Molar Physics, e. g. Mechanics, Planetary The- 

 ory, Lunar Theory. 



Synoptic Physical Sciences (not reduced to 

 ideal motions). 



Chemistry, Mineralogy, Geology, Geography, 

 Meteorology, Inorganic Evolution of the 

 Earth and the Planetary System. 



The Precise and the Synoptic Physical Sciences, 

 respectively, "correspond very closely to the phe- 

 nomena of which we have constructed a con- 

 ceptual model by aid of elementary corpuscles 

 having ideal motions, and to the phenomena 

 which have not been reduced to such a conceptual 

 description." . . . "Thus Synoptic Physical Sci- 

 ence is rather Precise Physical Science in the 

 making than qualitatively distinct from it. It 

 embraces large classifications of facts which we 

 are continually striving to resume in simple 

 formulae or laws, and, as usual, these laws are 

 laws of Motion. Thus considerable portions of 



