_Miasms_, such particles or atoms, as are supposed to arise from distempered, putrefying, or poisonous bodies. _Michilimackinac_, or _Mackinac_, (now frequently corrupted into _Mackinaw_, which is the usual pronunciation of the name,) a military post in the State of Michigan, situated upon an island about nine miles in circuit, in the strait which connects Lakes Michigan and Huron. It is much resorted to by Indians and fur traders. The highest summit of the island is about three hundred feet above the lakes, and commands an extensive view of them. _Midsummer_, with us, the time when the sun arrives at his greatest distance from the equator, or about the twenty-first of June, called, also, the summer solstice, (from the Latin _sol_, _the sun_, and _sto_, _to stop_ or _stand still_,) because, when the sun reaches this point, he seems to stand still for some time, and then appears to retrace his steps. The days are then longer than at any other time. _Migrate_, to remove from one place to another; to change residence. _Mildew_, a disease of plants; a mould, spot, or stain, in paper, cloths, &c., caused by moisture. _Militate_, to oppose, to operate against. _Millinet_, a coarse kind of stiff muslin, formerly used for the foundation or basis of bonnets, &c. _Mineralogy_, a science which treats of the inorganic natural substances found upon or in the earth, such as earths, salts, metals, &c., and which are called by the general name of minerals. _Minutiae_, the smallest particulars. _Monasticism_, monastic life; religiously recluse life, in a monastery, or house of religious retirement. _Montagu, Lady Mary Wortley_, one of the most celebrated among the female literary characters of England. She was daughter of Evelyn, Duke of Kingston, and was born about 1690, at Thoresby, in England. She displayed uncommon abilities, at a very early age, and was educated by the best masters in the English, Latin, Greek, and French, languages. She accompanied her husband (Edward Wortley Montagu) on an embassy to Constantinople, and her correspondence with her friends was published and much admired. She introduced the practice of inoculation for the smallpox into England, which proved of great benefit to millions. She died at the age of seventy-two, A. D. 1762. _Moral Philosophy_, the science which treats of the motives and rules of human actions, and of the ends to which they ought to be directed. _Moreen_, a kind of woollen stuff used for curtains, covers of cushions, bed hangings, &c. _Mucous_, having the nature of _mucus_, a glutinous, sticky, thready, transparent fluid, of a salt savor, produced by different membranes of the body, and serving to protect the membranes and other internal parts against the action of the air, food, &c. The fluid of the mouth and nose is mucus. _Mucous membrane_, that membrane which lines the mouth, nose, intestines, and other open cavities of the body.