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Those species of indicia which come more immediately under the cognizance of the senses, such as stains of blood on the person of one accused of murder, indications of terror at being charged with the offence, and the like.

Signa, although not to be rejected as instruments of evidence, cannot always be relied upon as conclusive evidence, for they are frequently explained away; in the instance mentioned the blood may have been that of a beast, and expressions of terror have been frequently manifested by innocent persons who did not possess much firmness.