Abridged and revised edition of my Ph.D. Thesis. Its theme was on Socio Economic Reform movement of the Nineteenth Century and to make a comparative assessment of the means and methods employed by the two eminent personalities in propagating the cause of social justice and reforms and furthering the cause of Arya Samaj and the liberals of the day. The work spans over Eight Chapters and each chapter dealing separately with the condition of Society before the Emergence of Reform Movements, The efficacy of Swami Dayanand Saraswati and the Establishment, Principles, and Impact of Arya Samaj and how it influences the various reforms ushered by Diwan Bahadur Harbilas Sarda.