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 328 MAEIA MITCHELL. continued her astronomical pursuits until the year 1865, when she was invited to become Professor of Astronomy at Vassar College, in the State of New York. She did not feel certain that she could suitably fill this interest- ing post, and hesitated some time before accepting it. It is certain that the institution has never regretted her favorable decision. She at once proved herself an excellent teacher, and the course in astronomy soon came to be regarded as one of the pleasantest, as well as one of the best that the college afforded. It is elective and informal, her classes being the only ones that are not begun and ended at the tap of an electric gong. The course consists, besides a few lectures in the Sophomore year, of regular lessons during the Junior and Senior years. It is chiefly practi- cal and mathematical ; including, however, some popular astronomy. The practical portion is that which most interests the professor, who is continually urging her pupils to use their eyes. She encourages them to make use also of the smaller telescopes every fair night, and allows the Seniors some independent use of the great Equatorial telescope in the observatory. She is apt to display some anxiety on these occasions, however, and seldom fails to warn a student who is going up to take an observation, not to hit her head against the telescope. Her fears, as she explains, are not for the head, but for the instrument. Drawings of the observations are inva- riably required. In class, Miss Mitchell is abrupt but kindly, expecting and obtaining from each student the best that she can do. With the plodding, modest girl, possessed of no brilliant qualities, but willing to work, she is always patient, and ready to give encouragement and assistance. To the superficial and the conceited she shows little mercy, considering it a part of her duty to abate their