This volume includes Russell's earliest philosophical writings, collected here for the first time. The 1895-1898 papers, few of which were published in Russell's lifetime, concentrate primarily on physics, arithmetic and the concept of quantity. Several views that later became well-known in his Principles of Mathematics actually originate in this earlier work, and though incomplete, An Analysis of Mathematical Reasoning forms a centerpiece for the volume. Writings from early 1898, where Russell advances beyond his initial insights and develops a range of new ideas in the philosophy of logic, comprise the remainder of the volume.