neither of the four is there the slightest notice of the others. 2.  Because, if either of the evangelists may be thought, from the remarkable similarity of any particular part of his narrative, to have copied out of either of the other Gospels, we immediately light upon so many other passages, wholly inconsistent with what the other three have related on the same subject, that we immediately ask why he has not copied from the others on those points also.  It only remains, therefore, for us to infer that there was a common source, first traditional and then written—­the [Greek:  Apomnemoneumata], in short, or ‘Memorials,’ etc., of Justin Martyr, and that from this source the four canonical Gospels, together with thirty or forty others, many of which are still in existence, were, at various periods of early Christianity, compiled by various writers” ("Christian Records,” Dr. Giles, pp. 266, 270, 271).  Dean Alford puts forward a somewhat similar theory; he considers that the oral teaching of the apostles to catechumens and others, the simple narrative of facts relating to Christ, gradually grew into form and was written down, and that this accounts for the marked similarity of some passages in the different Gospels.  He says:—­“I believe, then, that the Apostles, in virtue not merely of their having been eye-and-ear witnesses of the Evangelic history, but especially of their office, gave to the various Churches their testimony in a narrative of facts, such narrative being modified in each case by the individual mind of the Apostle himself, and his sense of what was requisite for the particular community to which he was ministering....  It would be easy and interesting to follow the probable origin and growth of this cycle of narratives of the words and deeds of our Lord in the Church at Jerusalem, for both the Jews and the Hellenists—­the latter under such teachers as Philip and Stephen—­commissioned and authenticated by the Apostles.  In the course of such a process some portions would naturally be written down by private believers for their own use, or that of friends.  And as the Church spread to Samaria, Caesarea, and Antioch, the want would be felt in each of those places of similar cycles of oral teaching, which, when supplied, would thenceforward belong to, and be current in, those respective Churches.  And these portions of the Evangelic history, oral or partially documentary, would be adopted under the sanction of the Apostles, who were as in all things, so especially in this, the appointed and divinely-guided overseers of the whole Church.  This common substratum of Apostolic teachings—­never formally adopted by all, but subject to all the varieties of diction and arrangement, addition and omission, incident to transmission through many individual minds, and into many different localities—­I believe to have been the original source of the common part of our three Gospels” ("Greek Test.,” Dean Alford, vol. i., Prolegomena, ch. i., sec. 3, par. 6; ed. 1859.  The italics are Dean Alford’s).