This is the chief test of credibility in all those cases where the witness, whose testimony has been reduced to writing, is dead, absent, or insane. Under such circumstances it is impossible to apply what may be termed personal tests on cross-examination; that is, to develop the impeaching or corroborating features of bias, prejudice, and personal demeanor to the same extent as when the witness is still living and testifies orally. When a written narrative is all that we have, its reliability can only be ascertained by a close inspection of its parts, comparing them with each other, and then with collateral and contemporaneous facts and circumstances. The value of this test cannot be over-estimated, and Greenleaf has stated very fully and concisely the basis upon which it rests. "Every event," he says, "which actually transpires, has its appropriate relation and place in the vast complication of circumstances of which the affairs of men consist; it owes its origin to the events which have preceded it, is intimately connected with all others which occur at the same time and place, and often with those of remote regions, and in its turn gives birth to numberless others which succeed. In all this almost inconceivable contexture and seeming discord, there is perfect harmony; and while the fact which really happened tallies exactly with every other contemporaneous incident related to it in the remotest degree, it is not possible for the wit of man to invent a story, which, if closely compared with the actual occurrences of the same time and place, may not be shown to be false."[28] [Illustration: ST. JOHN AND ST. PETER (DÜRER)]