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เนื้อหาย่อ : This book is intended primarily for the use of students in the higher divisions in schools, particularly for those who intend to take an Honours Course of Mathematics at a University, and also for University students preparing for a first Honours Examination. It is based upon courses of lectures given during many years to first-year students preparing for the Mathematical Tripos, and it is assumed that the majority of readers will already have acquired some knowledge of elementary dynumics. Although the book contains chapters on Orbits and the dynamics of Rigid Bodies, none the less it may claim to be a text-book on Elomentary Dynamics, for there is probably no branch of elementary Mathe- matics the content of which has expanded co greatly in the last twenty years. One of the changes that accompanied the reform of the Mathe- matical Tripos was the removal of the restriction that Elementary Mechanics meant Mechanics without the Calculus. Thisrestriction set well-defined and narrow bounds to the subject and the new regulations which gave teachers and students freedom to use any analytical methods in their work have been far reaching in their effect. Though the schedule in Dynamics for Part I of the new Tripos has remained unaltered, successive Examiners have added considerably to the interpretation of its contents. To give one instance only-the phrase 'motion under gravity' is now understood to mean 'in a resisting medium'--and it would be easy to give other examples of the elasticity of interpretation to which the schedule lends itself. The result of this change is that a first-year course in Dynamics at the University now includes all the easier problems of two-dimensional dynamics stopping short of the use of moving axes and Lagrange's Equations. This growth in the content of Elementary Dynamics has been a gradual process and undoubtedly benefcial to the study of the subject and stimulating to the average student. It is inevitable that its effect will extend to the schools, if it has not already done so; and it is not unreasonable to suppose that before many