Section 171
SEC. 171. All corporations whose capital stock is required or is-permitted to be paid in by the stockholders in regular, equal, periodical payments and whose purpose is to accumulate the savings of its stockholders, to repay to said stockholders their accumulated savings and profits upon surrender of their stock, to encourage industry, frugality, and home building among its stockholders, and to loan its funds and funds borrowed for the purpose to stockholders on the security of unencumbered real estate and the pledge of shares of capital stock owned by the stockholders as collateral security, shall be known as building and loan corporations, and the words "murual building and loan association" shall form part of the name of every such corporation.