The constitution of friendly societies, upon legal and scientific principles, exemplified by the rules and tables of the Southwell Friendly Institution ... [microform] : examined, authenticated, and recommended by John Tidd Pratt, as well as by William Morgan, and Arthur Morgan, together with complete tables for calculating, at every period of life, the value of the assurances ... / by John Thomas Becher ... to which is added, a system of book-keeping, now in general use among such institutions