Calculus Made Easy&#13;Being a very-simplest introduction to those beautiful methods which are generally called by the terrifying names of the Differential Calculus and the Integral Calculus by Being a very-simplest introduction to those beautiful methods which are generally called by the terrifying names of the Differential Calculus and the Integral Calculus Thompson, Silvanus P. (Silvanus Phillips)
 is a Project Gutenberg book, now on Github.