My mother was a vital young woman - nineteen when I was born - of simple faith and with the love of life. She met the hard years with real courage, determined that, whatever might come, her children should have a healthy and normal childhood. She helped my father and me in making and tending the large garden which supplied our table ...

At seven he had a long paper route and collected coal for the family from along the railroad tracks and at the railroad roundhouse where the fireboxes were dumped after a run.

We consider Mr C I Lewis one of our most worthy and capable young men. His ability is far above the average and I have never seen or heard anything to criticise in his character. He has been one of the leaders of his class in scholarship and would have stood much higher but for the fact of working so hard to get money to take him through school and into college.

This work ... fills an important hiatus in the literature of logistics and mathematical logic. These studies are of so recent an origin that there has been till now no opportunity to consolidate into a single treatise anything but their most simple and primitive aspects. Accordingly the student, after leaving the almost childishly simple Boolean algebra as presented in the writings of Couturat and del Ré, is immediately confronted with that forbidding monument of patience and research, the 'Principia Mathematica' of Whitehead and Russell. He encounters an unfamiliar symbolism, new methods, and a most exacting standard of rigour. It is only after he has become proficient in this new field that he can discern the fundamental unity underlying the investigations of Boole, De Morgan, Peirce, and Schröder, on the one hand, and those of Frege, Whitehead, and Russell, on the other. Professor Lewis has written a work that completely bridges over the gap between the old and the new. He treats the history of symbolic logic in an impartial and comprehensive way, slighting neither the founders of the classical theory nor the principal innovators of the present day. After a good resume of the classical theory of equations and inequations, he proceeds to a parallel development of the foundations of the logic of propositions, propositional functions, and classes on the Boole-<Peirce-Schröder basis and on that of the 'Principia', exhibiting both the formal identity of the two systems and the inadequacy of Peirce's enumerative method of defining universal and particular propositions in terms respectively of iterated logical multiplication and iterated logical addition. There is a mass of excellent detail work in this connection, so that this part of the book should prove useful as a glossary for those who desire to transfer statements from the Peirce symbolism to that of Russell and vice versa.

Professor Lewis' Carus lectures 'An Analysis of Knowledge and Valuation' comprise three books and an introduction. Their ultimate objective is to develop (in Book III) the thesis that valuation is a form of empirical knowledge. The nature of empirical knowledge is the topic of Book II; that of a priori knowledge, of Book I. The treatment has the originality and technical expertness which have marked Lewis' earlier publications, and the book is undoubtedly one of the major modern contributions to basic philosophical theory. Any number of questions of fundamental importance are subjected in it to penetrating analysis. The book is tacitly addressed to technically equipped students of philosophy, although some pages here and there would be rewarding to the more thoughtful general reader. The style is lucid enough but it assumes interest on the reader's part in the questions discussed rather than makes any attempt to arouse it. The presentation is rather prolix, often repetitious, and devoid of dramatic quality. There are many places where greater terseness would have given more psychological punch to Lewis' contentions.

Lewis was a splendid teacher, conscientious, serious, always seeking the truth and seeking to convey it; never condescending and never pretending; not showy but with a wry wit and a salty humour. Basically, he was a good teacher because he was a careful scholar and a clear thinker, honest with himself and with his students. Many a graduate student who came to Harvard's philosophy department because of the repute of the University, the department, or some more famous professor, found the most lasting impression was that made by Lewis. One detail will give a hint of his probity. Having assigned his own book as a text, he told our class that, if we would bring the receipt from the bookstore, he would refund the amount of his royalty.

Let us attempt to sum up the influence of Lewis's writing and teaching. He is the principal founder of the modern symbolic treatment of modal logic and theory of entailment. He contributed to the history of logic. His 'Survey' was a pioneer textbook, and both of his logic books combined pedagogical value with important contributions to the subject. His contributions to philosophy of logic and to epistemology are important and influential. He has heightened the awareness of the interrelations between logic, epistemology, and value theory; and has made a strong case for cognitivism in valuation.