4. Private documents include deeds, wills, agreements and the like. Of course when a will has been proved, it becomes a public document. (See PROBATE.) As to private documents which prove themselves, see ANCIENT WRITINGS. 15. A document of title is a document which enables the possessor to deal with the property described in it as if he were the owner. In this way a bill of lading represents the goods while they are at sea, and by it, when the goods arrive at the port of destination, the possession of the goods may be obtained (Gunn v. Bolckow, Vaughan & Co., L. R. 10 Ch 502,) either by the person to whom the bill of lading was originally given, or by a person to whom he has transferred it, which he may do absolutely or by way of charge, &c. Some documents of title (as in the case of a bill of lading) pass the ownership of the goods represented by them, while others, such as delivery orders and dock warrants (q. v.), are mere authorities to obtain delivery of them. See Benj. Sales 673. See, also, NEGOTIABLE. (when killing justified). 9 Johns. (N. Y.) 233; 13 Id. 312.