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A N ESSAY ON THE Different Caufes O F PeftilentialDifeafes And how they become Contagious, WITH R E M ARK Upon the Infection now in A N C ' E. John Q.u incy, M. D. Clje C&fca esittot, Mil) large 9Wt0Rt& L O N D O N: Printed for JE. Bff 7 at the Crofs-Keys and Bible in Cornhilt^ and J. Ofisorn^ at the Oxfird-j4rms ia Lombard-fire et 7 3721.
