A comparison by the Juxtaposition of two writings, in order, by such comparison, to ascertain whether both were written by the same person. A method of proof resorted to where the genuineness of a written document is disputed; it consists in comparing the handwriting of the disputed paper with that of another instrument which is proved or admitted to be in the writing of the party sought to be charged, in order to infer, from their identity or similarity in this respect, that they are the work of the same hand.