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The Development of Material Knowledge 343 in the world, it was not making scientific and in- ventive men rich and powerful. There is a necessary unworldliness about a sincere scientific man ; he is too preoccupied with his research to plan and scheme how to make money out of it. The economic exploitation of his discoveries falls very easily and naturally, there- fore, into the hands of a more acquisitive type ; and so we find that the crops of rich men which every fresh phase of scientific and technical progress has produced in Great Britain, though they have not displayed quite the same passionate desire to in- sult and kill the goose that laid the national golden eggs as the scholastic and clerical professions, have been EIGHTEENTH CENTURY SPINNING WHEEL {/n Ipswich Museum) MODEL OF ARKWRIGHT'S SPINNING JENNY, 1769 {From ike specification in tJie Patent OJfice)