$2 Sir Oliver Lodge on 



3. That this extra or high-speed inertia is not part of the 

 mass but is dependent on the aether and hence is not 

 subject to gravity. 



4. That from this reasonable hypothesis astronomical 

 consequences follow which may be detected when 

 cumulative. 



5. That under certain specified conditions merely a small 

 change in excentricity is to be expected as the chief 

 result, in certain others an apsidal progress or regress 

 is to be expected. 



6. That the outstanding discrepancy in the theory of the 

 perihelion of Mercury would be accounted for by attri- 

 buting a certain value to a component of the true solar 

 motion through the aether in the direction of the planet's 



aphelion path. 



7. That using this value for the solar-plus-stellar drift, 

 yiz. two or three times the earth's orbital velocity, a 

 result can be obtained for ihe perihelion of Mars, 

 subject to a hypothesis about direction. 



8. That by discussion of discordances in the elements of 

 different planets an estimate may be formed of the 

 magnitude and direction of the locomotion of the solar 

 system in its invariable plane. 



Addendum. 



I have inquired from Professor Eddington what is the 

 outstanding discrepancy of Mars ; and he replies 



£o^=+0"-64±0"-35. 



This value (without the probable error) happens to agree 

 exactly with what is reckoned above in equation (10), since it 

 gives an apsidal progress oV of 7" per century. 



Note on the 'possible deflexion of Light, 



It becomes a question whether the gravitative deflexion of 

 a, ray of light, predicted by Einstein, also follows from aether 

 theory. A wave-front undoubtedly simulates some of the 

 properties of matter. It conveys momentum, as Poynting 

 has shown, and an advance wave-front presumably has to 

 sustain and convey the light-pressure until a target is struck. 

 The mechanical stress exists ultimately between source and 

 receiver ; but though one end acts on the source, all the time, 

 the other end of the stress has to react on the advancing 

 wave-front until the receiver is reached, unless Newton's 



