Abstract
The paper contains a discussion of the necessity for using a coordinate condition in the calculations for the derivation of the equations of motion from the field equations. It is found that no coordinate condition is necessary in the first approximation; i.e. one gets the Newtonian equations of motion if one merely assumes that the gravitational field is weak and quasi-static. In the higher approximations a coordinate condition is indispensable in order to eliminate all apparent accelerations from the equations of motion
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