"Words are witnesses which often speak louder than documents. Let us consider a few English words, which were invented or gained their modern meanings, substantially in the period of sixty years with which this volume deals. They are such words as 'industry', 'industrialist', 'factory,' middle class,' 'working class,' and 'socialism.' They include 'aristocracy,' as well as 'railway,' 'liberal' and 'conservative' as political terms, 'nationality,' 'scientist,' and 'engineer,' 'proletariat,' and (economic) 'crisis'."