Missions to the Oriental Churches occupy a large space in the forty-nine volumes of the Missionary Herald, and in as many Annual Reports of the Board; and in view of the multitude of facts, from which selections must be made to do justice to the several missions, it will readily be seen, that their history cannot be compressed into a single volume.

The Missions may be regarded as seven or eight in number; considering the Palestine and Syria missions as really but one, and the several Armenian missions as also one.

The history of the Syria mission, in its connection with the American Board, covers a period of fifty-one years; that of the Nestorian, thirty-seven; that of the Greek mission, forty-three; of the Assyrian (as a separate mission), ten; of the Armenian mission, to the present time, forty; and of the Bulgarian, twelve.

The mission to the Jews, extending through thirty years, was so intimately connected with these, as to demand a place in the series; and the facts scattered through half a century, illustrating the influence exerted on the Mohammedans, are such as to require a separate embodiment.
In writing the history, one of three methods was to be adopted; either to embrace all the missions in one continuous narrative; or to carry forward the narrative of each mission, separately and continuously, through its entire period; or, rejecting both these plans, to keep the narratives of the several missions distinct, but, by suitable alternations from one to another, to secure for the whole the substantial advantages of a contemporaneous history.

The first could not be done satisfactorily, so long as the several missions have a separate existence in the minds of so many readers, and while so many feel a strong personal interest in what is said or omitted.