Fatio suggested an ether model based on small and fast particles moving in all directions. Ether particles were assumed to exchange energy with matter by collisions. So, forces were assumed to move between m and M. However, this is not possible, since m and M are in different positions and do not know about each other. So, they cannot together define the product mxM.
If we instead assume matter to absorb ether particles (like a crystal absorbing a fast electron and generating an X-ray wave packet) we instead find that gravity emerges inside m and M by effects from the ether. So, gravity in m is caused by those particles that is absent in m due to absorption in M. The property of emergence means that gravity does not move and therefore no aberration is caused.
A small change of the type of interaction means that Fatio's model can explain gravity.
With best regards from __________________ John-Erik Persson