Habits of industry should be inculcated as they grow up, and the field of their operations enlarged when they are grown, by portioning out lands and providing a market for their surplus stock and produce. Some of the useful mechanical arts could also be introduced, but only those that are useful in their present condition and growing state. A century or two may elapse before watchmakers, glass blowers, or even tailors and shoemakers would be necessary, though a few gunsmiths, blacksmiths, carpenters, and weavers would find immediate employment. The principles of the Christian religion would of course at the same time be taught, but the principal feature of these establishments, as soon as the boys and girls were able to work, should be industry, principally in agricultural and pastoral pursuits. The great errors into which missionaries have fallen are that they make the observance of religious duties the sole object and neglect the others.[16] Also their zeal in this induces them to interfere with the present government, domestic arrangements, and superstitions of the grown Indians, thereby incurring their enmity, disgust, or revenge. The present grown-up generation should be left entirely alone, not interfered with, no attempt made to convert them, or even induce them to work. It is useless, inexpedient, and subverts the general ends. The first thing a missionary does is to abuse the Indian for having a plurality of wives. [16] Here Denig mildly protests against the unreasonable emphasis placed on the observance of religious rites by the missionaries to the exclusion of other duties.