The INTRODUCTION. xix 
croscopes furnifh us as it were with a 
new Senfe, unfold the amazing Operations 
of Nature, and prefent us with Wonders 
un thought of by former Ages. „ 
Who, a thoufand Years ago, would have 
imagined it poilihle to diftinguifh Myriads 
of living Creatures in a tingle Drop of Wa- 
tei; ? Or, that the Purple Tide of Life, and 
even the Globules of the Blood fhould be 
feen diflindtly, rolling thro’ Veins and Arte¬ 
ries ftnaller than the fin ell Hair ? That Mil¬ 
lions of Millions of Animalcules fhould be 
difcovered in the Semen MafcuRnum of all 
Creatures? That not only the exterior Form, 
but even the internal Structure of the Bow¬ 
els, and the Motion of the Fluids in a Gnat 
or Loufe , fhould be rendered Objects of 
Sight ? Or, that numberleis Species of Crea¬ 
tures fhould be made vliable, tho’ fo minute, 
that a Million of them are lefs than a Grain 
of Sand ? 
Thefe are noble Discoveries , whereon a 
new Philofophy has been railed, that en¬ 
larges the Capacity of the human Soul, and 
a 2 furniihe§ 
