Emend.), probably the form to which Danilewsky's original investigations related, parasitic in owls and (according to Novy and McNeal) also in other birds (fig.
The trouble began early in the 17th century with the attempt, made in connexion with the printing of the liturgical books, to emend certain ritual details in which there was proved to have been a departure from primitive usage; 1 it came to a head under the patriarch Nikon.