American School of Correspondence, Cyclopedia of Commerce, Accountancy…
“ A person may be a member of a corporation, and be entitled to the rights of a stockholder, without having a certificate of stock. Certificates are convenient as evidence of membership. Transfers of stock are usually made by filling in a blank on the back of the certificate for that purpose, by which the owner declares the transfer to the purchaser, and designates the purchaser, or someone, his attorney to present the certificate to the corporation, to have the transfer registered on the books of the company. It is the usual custom to surrender certificates to the purchaser. ”
