17,2 Reviews 237 
Commercial Research | An Outline of Working Principles | by | C. S. Duncan, 
Ph. D. | [three lines of titles] | New York | The Macmillan Company 
| 1919 | Cloth, pp. i-ix + 1-885. 
FROM THE PREFACE 
The theory of this book can be simply stated; it falls readily 
into a series of propositions which have guided the writer from 
first to last in the composition: 
1. The immediate and primary need of business to-day is 
intelligent direction and control, individually, generally. 
2. Intelligent direction and control of business can be had 
only by a better knowledge of business principles. 
3. A better knowledge of business principles can be derived 
only from a careful and comprehensive survey of business facts. 
4. To secure a careful and comprehensive survey of business 
facts is a problem for business research. 
5. Therefore, the immediate and primary need of business 
to-day can be met only by business research. 
This means, also, that the research work so well begun in 
the field of production should be carried over into trade, into 
buying and selling. The beginning and the end of every busi- 
ness enterprise is a marketing problem. The problems of 
marketing, therefore, like factory problems, must be isolated, 
abstracted, analyzed after the scientific method. More delib- 
erate, concentrated, prolonged and undisturbed thinking ought 
to be applied to business problems. They are of vital import- 
ance to success; they are fascinatingly interesting in themselves ; 
their very difficult complexity is a stimulating intellectual chal- 
lenge; the rewards which their correct solution offers have no 
determinable limit. 
Syphilis | A Treatise on Etiology, Pathology, | Diagnosis, Prognosis, Pro- 
phylaxis, | and Treatment | by | Henry H. Hazen, a. oy me. D. | 
[ten lines of titles] | with 160 illustrations including 16 figures | 
in colors | St. Louis | C. V. Mosby Company | 1919 | Cloth, pp. 7-647 
including index, $6.00. 
FROM THE PREFACE 
At the present time there exists no small book that covers 
the whole field of syphilis in an authoritative way. To know 
syphilis means to know the entire domain of medicine, and 
for any one man this is impossible. In the preparation of 
this work I have been fortunate in being able to induce various 
men to write special chapters for me. Many other friends 
and acquaintances have aided in various ways, either with illus- 
