Some apology seems necessary for the production Of another treatise on a subject so well-worn as Mechanics. The present work, however, makes no attempt at the mathematical treatment generally adopted. It aims rather at using the subject as a means Of scientific training, and as an illustration of the method of examining Nature by reasoning and experiment. It appeals to that large class Of people in all stations Of life who have not the training necessary for the enjoyment of Mathematical Gymnastics, but yet take keen interest in the purely experimental side Of science. The mathematical side Of the question has therefore been dispensed with, only the simplest arithmetical examples being admitted where reference to figures was unavoidable.