The preceptor's assistant, or Student's guide : being a systematical treatise of arithmetic, both vulgar and decimal; calculated for the use of schools, counting houses, and private families. Wherein the most practical branches of that important art are laid down in so plain and concise a manner, that persons of common capacity may become acquainted, in a short time, with that beneficial science. By John Vinall, teacher of the mathematics and writing, in Boston. [One line of quotation in Latin].