Here's an extract from Mary Robinson's Memoirs about the most memorable of her schools (follow the link for more about her):

Within a few days of our arrival in London we were placed for education in a school at Chelsea. The mistress of this seminary was perhaps one of the most extraordinary women that ever graced, or disgraced, society; her name was Meribah Lorrington. She was the most extensively accomplished female that I ever remember to have met with; her mental powers were no less capable of cultivation than superiorly cultivated. Her father, whose name was Hull, had from her infancy been the master of an academy at Earl's Court, near Fulham; and early after his marriage losing his wife, he resolved on giving this daughter a masculine education. Meribah was early instructed in all the modern accomplishments, as well as in classical knowledge. She was mistress of the Latin, French, and Italian languages; she was said to be a perfect arithmetician and astronomer, and possessed the art of painting on silk to a degree of exquisite perfection. But, alas ! with all these advantages she was addicted to one vice, which at times so completely absorbed her faculties as to deprive her of every power, either mental or corporeal. Thus, daily and hourly, her superior acquirements, her enlightened understanding, yielded to the intemperance of her ruling infatuation, and every power of reflection seemed lost in the unfeminine propensity.

All that I ever learned I acquired from this extraordinary woman. In those hours when her senses were not intoxicated, she would delight in the task of instructing me. She had only five or six pupils, and it was my lot to be her particular favourite. She always, out of school, called me her little friend, and made no scruple of conversing with me (sometimes half the night, for I slept in her chamber), on domestic and confidential affairs. I felt for her a very sincere affection, and I listened with peculiar attention to all the lessons she inculcated. Once I recollect her mentioning the particular failing which disgraced so intelligent a being. She pleaded, in excuse of it, the immitigable regret of a widowed heart, and with compunction declared that she flew to intoxication as the only refuge from the pang of prevailing sorrow. I continued more than twelve months under the care of Mrs. Lorrington, during which period my mother boarded in a clergyman's family at Chelsea. I applied rigidly to study, and acquired a taste for books, which has never, from that time, deserted me. Mrs. Lorrington frequently read to me after school hours, and I to her. I sometimes indulged my fancy in writing verses, or composing rebuses, and my governess never failed to applaud the juvenile compositions I presented to her.