164 Of the Animalcules 
Agility: and, befides, every one of thefe 
Joints muft be provided with its proper Muf- 
cles. Nerves, Arteries, and Veins ; and alfo 
with Fluids circulating thro’ them, and fup- 
plying them with Nourifhment, Strength, 
and Motion. In fihort, the Mind lofes itfelf 
in contemplating a Minutenefs beyond all 
human Conception ; tho’ Reafon tells us it 
certainly muft be. I remember ©r. Power 
has a fine Paftage to this Purpofe in the 
Preface to his Experiments: 44 It has often 
44 feemed to me (fays he) an ordinary Pro- 
44 babilitv, and fomething more than Fancy 
44 (how paradoxical foever the Conjecture 
44 may feem), to think, that the leaft Bodies 
44 we are able to fee with our naked Eyes 
44 are but middle Proportionals , as it were, 
44 betwixt the greatejl and the fmallejl Bo- 
44 dies in Nature ; which two Extremes 
44 lie equally beyond the Reach of human 
44 Senfation. — For, as on one Side they are 
44 but narrow Souls, and not worthy the 
44 Name of Philofophers , that think any 
44 Body can be too great or too vajl in its 
44 Dimenfions : fo likewife are they as in- 
44 apprehenfive, and of the fame Litter with 
44 the former, that, on the other Side, think 
44 the Particles of Matter may be too little , 
44 or that Nature is ftinted at an Atom, and 
iS muft have a Non ultra of her Subdivi- 
** lions.’ 1 * 
As 
