2014 Reprint of 1963 Edition. Full facsimile of the original edition, not reproduced with Optical Recognition Software. Stratonovich was a Russian physicist, engineer, and probabilist and one of the founders of the theory of stochastic differential equations. The genesis of this book, the first of two volumes concerned with various topics in the theory of random noise, is evidenced in the author's remark, "Random processes are of great and ever increasing interest to scientists and engineers working in various branches of radio physics." The major context and relative emphases of this book...