She was a thoroughly good housekeeper herself. Her conscience went into this, as into all her other business. "Housewifery is supposed to transact itself," she wrote; "but in reality it requires all the faculties which can be brought to bear upon it, and all the good moral habits which conscience can originate." It was in this spirit that she wrote instructions for servants. The fine moral tone invariably discoverable in her works, is as delightful here as elsewhere. But the little "Guides to Service," contain also the most precise and practical directions for the doing of the household duties and the needlework which fall to the hands of the classes of servants for whom she wrote. Practical hints are given from which the majority of these classes of women-workers might learn much, for _brains tell_ in the mean and dirty scrubbery of life as well as in pleasanter things, and science is to be applied to common domestic duties as to bigger undertakings. The heart and mind of Harriet Martineau were equal to teaching upon matters such as these, as well as to studying the deeper relations of mankind in political economy, or the state of society in a foreign land. Her great power of sympathy enabled her to enter fully into every human position. So well was the maid-of-all-work's station described, and her duties indicated, and her trials pointed out, and how she might solace herself under those troubles discovered, and the way in which her work should be set about detailed, that the rumor spread pretty widely that Harriet had once occupied such a situation herself. She regarded this mistake with complacency, as a tribute to the practical character of her little work.