Aryan declension naturally disappeared with the loss of final syllables.
The chief work of Choeroboscus, which we have in its complete form, is the commentary on the canons of Theodosius on Declension and Conjugation.
There had indeed been previous immigrations, but the passage from the desert into the midst of Palestinian culture led to the adoption of the old semi-heathenism of the land, a declension, and a descent from the relative simplicity of tribal life.
The Aryan system of inflexion was preserved in Celtic, as may be seen in Stokes 's restoration of Celtic declension (Trans.
The differences in declension between Old Persian and ad are unimportant.