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The principal factors in study

An extensive study, like this investigation, into the cause of yellow fever employs induction very plainly. It also employs deduction extensively, inasmuch as hypotheses that have been reached more or less inductively have to be widely applied and tested, and further conclusions have to be drawn from them. Such a study, therefore, involving both induction and deduction and their numerous short cuts, contains the essential factors common to the investigation of other topics, or to study in general; for different subjects cannot vary greatly when it comes to the general method of their attack. An analysis, therefore, which reveals the principal factors in this study is likely to bring to light the main factors of study in general.

1. The finding of specific purposes, as one factor in study

If the search for the cause of yellow fever were traced more fully, one striking feature discovered would be the fact that the investigation was never aimless. The need of unraveling the mystery was often very pressing, for we have had three great epidemics of yellow fever in our own country since 1790, and scientists have been eager to apply themselves to the problem. Yet a specific purpose, in the form of a definite hypothesis of some sort, was felt to be necessary before the study could proceed intelligently.

Thus, during the epidemic of 1793, the contagiousness of the disease was debated. Then the theory of "fomites" arose, and underwent investigation. Finally, the spread of the disease through the mosquito was proposed for the solution. And while books of reference were examined and new observations were collected in great number, such work was not undertaken by the investigators primarily for the sake of increasing their general knowledge, but with reference to the particular issue at hand.

The important question now is, Is this, in general, the way in which the ordinary student should work? Of course, he is much less mature than the scientist, and the results that he achieves may have no social value, in comparison. Yet, should his method be the same? At least, should his study likewise be under the guidance of specific purposes, so that these would direct and limit his reading, observation, and independent thinking? Or would that be too narrow, indeed, exactly the wrong way? And, instead of limiting himself to a collection of such facts as help to answer the few problems that he might be able to set up, should he be unmindful of particular problems? Should he rather be a collector of facts at large, endeavoring to develop an interest in whatever is true, simply because it is true? Here are two quite different methods of study suggested. Probably the latter is by far the more common one among immature students. Yet the former is the one that, in the main, will be advocated in this book as a factor of serious study.