The same caste prejudices have often kept the mass of the upper classes in ignorance of most valuable and important branches of knowledge. The poor have been ignorant, yet never proud of their ignorance; the ignorance that men are proud of belongs to caste always, not always to what we should call an aristocratic caste, but to the caste-feeling in one class or another. The pride of the feudal baron in being totally illiterate amounted to self-exclusion from all intellectual culture, and we may still find living instances of partial self-exclusion from culture, of which pride is the only motive. There are people who pass their time in what are considered amusements (that do not amuse), because it seems to them a more gentlemanly sort of life than the devotion to some great and worthy pursuit which would have given the keenest zest and relish to their whole existence (besides making them useful members of society, which they are not), but which happens to be tabooed for them by the prejudices of their caste. There are many studies, in themselves noble and useful, that a man of good family cannot follow with the earnestness and the sacrifice of time necessary to success in them, without incurring the disapprobation of his friends. If this disapprobation were visited on the breaker of caste-regulations because he neglected some other culture, there would still be something reasonable in it; but this is not the case. The caste-regulation forbids the most honorable and instructive labor when it does not forbid the most unprofitable idleness, the most utter throwing away of valuable time and faculty. Tycho Brahe feared to lose caste in becoming the most illustrious astronomer of his time; but he would have had no such apprehension, nor any ground for such apprehension, if instead of being impelled to noble work by a high intellectual instinct, he had been impelled by meaner passions to unlimited self-indulgence. Even, in our own day these prejudices are still strong enough, or have been until very lately, to keep our upper classes in great darkness about natural knowledge of all kinds, and about its application to the arts of life. How few gentlemen have been taught to draw accurately, and how few are accurately acquainted with the great practical inventions of the age! The caste-sentiment does not, in these days, keep them ignorant of literature, but it keeps them ignorant of _things_. A friend who had a strong constructive and experimental turn, told me that, as a rule, he found gentlemen less capable of entering into his ideas than common joiners and blacksmiths, because these humble workmen, from their habit of dealing with matter, had acquired some experience of its nature. For my own part, I have often been amazed by the difficulty of making something clear to a classically educated gentleman which any intelligent mechanic would have seen to the bottom, and all round, after five or six minutes of explanation.