[en] The principles of relativistic mechanics are all implicitly contained in Einstein's field equations. In order to obtain actual solutions for the field equations, appropriate expressions are required for the Christoffel three index symbols and for the components of the energy momentum tensor in terms of the quantities used in expressing the proposed line elements. The usual three-index symbols, the contracted curvature tensor and the equations of geodesics for a general spherically symmetrical line-element required for the purpose have been worked out. (K.B.)