- McDowell, W. J., (Surgeon) author1
- McGowan, Jonas Hartzell, 1837-19091
- McGowan, Jonas Hartzell, 1837-1909, author1
- McGuire, J. P., author1
- McKay, Read Jennings, author1
- McKinney, Henry, author1
- McNutt, W. F. (William Fletcher), 1839- , author1
- Medical Association of the District of Columbia.1
- Medical Society of Nova Scotia, author.1
- Meigs, J. Forsyth (John Forsyth), 1818-1882, author1
- Meigs, James Aitken, 1829-18791
- Mendez Estrada, Fernando, author1
- Mexico, enacting jurisdiction.2
- Michel, Charles E. (Charles Eugene), 1833-1913, author1
- Middlesex South District Medical Society (Middlesex County, Mass.), author.1
- Middleton & Warner (Firm)1
- Miller, Adam, 1810-19011
- Mills, Geo. A., author3
- Mississippi. Attorney-General's Office, author, addressee.1
- Mississippi. State Board of Health, author, addressee.1