652 Dr. C. V. Burton on the 



surface BOEF, and the motion in question will clearly have 

 no tendency to cause either an accumulation or a depletion 

 of aether within BCEF. Thus if we keep the filament heated 

 by a current flowing along it, aether will on the whole be 

 streaming out of the space BCEF, and provided the operation 

 can be long enough continued, the quantity of aether emitted 

 from the space in question can be made as great as we please. 

 This would imply an actual creation of aether. 



23. It might be argued that, in any realizable case, the 

 flow of aether would be very minute, and if we proceed on 

 the assumption that radiation pressure is due to the impact 

 of bodily aetherial momentum this is probably true ; it is 

 certainly true that no operation of the kind just indicated 

 has been carried out for more than a limited time ; but it 

 seems not unreasonable to suppose that the bulk-modulus of 

 elasticity of the aether is enormously great, aud is in some 

 way responsible for the very high velocity with which gravi- 

 tational influences are propagated. Thus even a minute 

 emission of aether from within a given closed surface would 

 appear likely to be promptly opposed, owing to the expansion 

 which must then be experienced by some at least of the aether 

 contained by that surface. Indeed, unless the systematic 

 creation of aether can be accepted with equanimity, such an 

 opposing reaction must set in from the first, and gradually 

 increase in intensity with the duration of the outflow of 

 aether, becoming in any case of importance if the outflow is 

 lon^ enough maintained. 



21. Again, consider a train of electromagnetic waves in 

 free aether, specified as follows 



(F, G,H)={A/ S .sin4z-W), 0,0}, . . (11) 



(a,&,c)={0,Aco S *0-VO,0} ) 

 (P, Q, K)={VAcos<c-V0,0,0}j" ' ' l ~ ; 



If we substitute for A a different parameter B, the magnetic 

 induction (a, b, c) and the electromotive inten:»ity (P, Q, P) 

 will be changed in magnitude, and in the same proportion, 

 namely, B : A, the wave-motion remaining of precisely the 

 same type as before, and being changed only in amplitude. 

 But according to the doctrine now under consideration, the 

 translational velocity of the aether at any point at any instant, 

 being proportional to 



(6R-cQ, cP-aR, aQ-6P), 



-will be changed, not in the ratio B : A but in the ratio 



so 



that 



