  In 1917 Einstein published his Cosmological Considerations Concerning the
General Theory of Relativity. In it was the first use of the cosmological
constant. Shortly thereafter Schr\"odinger presented a note providing a
solution to these same equations with the cosmological constant term transposed
to the right hand side thus making it part of the stress-energy tensor.
Einstein commented that if Schr\"odinger had something more than a mere
mathematical convenience in mind he should describe its properties. Then
Einstein detailed what some of these properties might be. In so doing, he gave
the first description of Dark Energy. We present a translation of
Schr\"odinger's paper and Einstein's response.
