No Person shall sell Arsenic to any Person who is unknown to the Person selling such Arsenic, unless the Sale be made in the Presence of a Witness who is known to the Person selling the Arsenic, and to whom the Purchaser is known, and who signs his Name, together with his Place of Abode, to such Entries, before the Delivery of the Arsenic to the Purchaser, and no Person shall sell Arsenic to any Person other than a Person of full Age.