[Footnote 2: The New Atlantis.]
Science sometimes appears so remote and alien to the immediate concrete objects which meet and interest us in daily experience that we tend to forget that historically it was out of concrete needs and practical interests that science arose. Geometry, seemingly a clear case of abstract and theoretical science, arose out of the requirements of practical surveying and mensuration among the Egyptians. In the same way botany grew out of herb gathering and gardening.
The application of the exact knowledge gained by the pure sciences, may, if properly directed, immeasurably increase the sum of human welfare. One has but to review briefly the history of invention to appreciate this truth with vividness and detail. The great variety of the "applied sciences" shows the extent and multiplicity of the fruits of theoretical inquiry. Astronomy plays an important part in navigation; but it also earns its living by helping the surveyor and the mapmaker and by supplying the world with accurate time. Industrial chemistry offers, perhaps, the most striking examples. There is, for example, the fixation of nitrogen, which makes possible the artificial production of ammonia and potash; the whole group of dye industries made possible through the chemical production of coal tar; the industrial utilization of cellulose in the paper, twine, and leather industries; the promise of eventual production on a large scale of synthetic rubber; the electric furnace, which, with its fourteen-thousand-degree range of heat, makes possible untold increase in the effectiveness of all the chemical industries.
Industrial chemistry is only one instance. The application of theoretical inquiry in physics has made possible the telegraph, the telephone, wireless telegraphy, electric motors, and flying machines. Mineralogy and oceanography have opened up new stores of natural resources. Biological research has had diverse applications. Bacteriological inquiry has been fruitfully applied in surgery, hygiene, agriculture, and the artificial preservation of food. The principles of Mendelian inheritance have been used in the practical improvement of domestic animals and cultivated plants. The list might be indefinitely extended. The sciences arose as attempts, more or less successful, to solve man's practical problems. They became historically cut off, as they may in the case of the pure scientist still be cut off, from practical considerations. But no matter how remote and abstract they become, they yield again practical fruits.
Applied science, if it becomes too narrowly interested in practical results, limits its own resources. Purely theoretical inquiry may be of the most immense ultimate advantage. In a sense the more abstract and remote science becomes, the more eventual promise it contains. By getting away from the confusing and irrelevant details of particular situations, science is enabled to frame generalizations applicable to a wide array of phenomena differing in detail, but having in common significant characteristics. Men can learn fruitfully to control their experience precisely because they can emancipate themselves from the immediate demands of practical life, from the suggestions that arise in the course of instinctive and habitual action. "A certain power of abstraction, of deliberate turning away from the habitual responses to a situation, was required before men could be emancipated to follow up suggestions that in the end are fruitful."[1]
[Footnote 1: Dewey: How We Think, p. 156.]
Too complete absorption in immediate problems may operate to deprive action of that sweeping and penetrating vision which a freer inquiry affords. The temporarily important may be the less important in the long run. A practical adjustment of detail may produce immediate benefits in the way of improved industrial processes and more rapid and economical production, but some seemingly obscure discovery in the most abstruse reaches of scientific theory may eventually be of untold practical significance.
Only the extremely ignorant can question the utility of, let us say, the prolonged application of the Greek intellect to the laws of conic sections. Whether we think of bridges or projectiles, of the curves of ships, or of the rules of navigation, we must think of conic sections. The rules of navigation, for instance, are in part based on astronomy. Kepler's Laws are foundation stones of that science, but Kepler discovered that Mars moves in an ellipse round the sun in one of the foci by a deduction from conic sections.... Yet the historical fact is that these conic sections were studied as an abstract science for eighteen centuries before they came to be of their highest use.[2]
[Footnote 2: Thomson: Introduction to Science, pp. 239-40.]
Pasteur, whose researches are of such immediate consequence in human health, began his studies in the crystalline forms of tartrates. The tremendous commercial uses which have been made of benzene had their origin "in a single idea, advanced in a masterly treatise by Auguste Kekule in the year 1865."[1]