2 8 The Caufes and Cure of thofe Nations and States are to be jufti" fled, who enjoin all Perfons and Merchandize from infe&ed Countries, to flay a certain Time upon their Coafts and Borders, before they are fufered to intermix with a health- ful People ' 7 having by fuch Inftances as here mentioned been jufrly alarmed at the In- croachment of fuch dreadful Deftroyers. THESE Historical. Fragments are put together, in Order to apprize thofe Readers who have not been very converfant with Things of this Kind, with the various Ways by which the molt dangerous Difeafes, and even Hidden Death, may be introduced into our Conlikutions, by the Agency of very minute zr& unheeded Caufes and iikewile the better to fupport the Diftinction ne^ celiary to be made between Evidemic Dif- eafes, and a Contagion j as well as to illustrate the Manner whereby the latter fubfifts, fpreads, and proves fatal, when the Caufes producing the former are abient. Efidernicl Difeafes of all Kinds and De- crees of Exacerbation, have their Rife from ibme common Caufe, that aife&s all within its Extent more or lefs, in Proportion to the particular Fitnefs of different Conftitutions to
