Anticipations of dark energy in the work of Schr\"{o}dinger

I'll examine the advocacy by Schr\"{o}dinger of a cosmological constant, or its equivalent, beginning with his 1917 paper ``Concerning a System of Solutions to the Generally Covariant Equations for Gravitation,'' and continuing with his efforts in the 1940s toward a unified field theory. I'll discuss Schr\"{o}dinger's idea that electromagnetism as well as gravitation was attenuated at long distances due to such a construct. I'll remark how these ideas anticipated modern discussions about dark energy.