( vi ) 



'Next, I obforve another kind of aiiimalcule, wliicli, mcaiiiring, by 



* my eye through a good niicrofcope, I judge the axis or thicknels 



* of it to be one fiftli, but fuppofe it only a fourtli jiart of the fize of 

 ' thefirft animalcule D, fuch as is reprefented by the circle E, and 



* th.en, by the fame rule, the fize of D muft be 64, times larger than 



* that of E; and if this laft number be multiplied by the former, 



* (1728) ^ve Ihall find that 110,592 animalcules of tlie fize of E, 

 ' (fiippofing tlicir bodies to be of a fpherical figure), Avill be required 

 ' to make up the fize of the fphere A BGC. Laftly, I perceive a 

 ' third kind of animalcule, the fize of which appears to be only a 

 ' tenth part of the animalcule at E, fuch as the point at F denotes ; 

 ' and that confequently, one thoufand of thefe will be more than equal 

 ' to the fize of that at E. And, if this number be again multiplied by 



* the former, it will be plain to demonftration, that more than an 



* hundred millions of animalcules can be contained within tlic com- 



* pafs of a grain of fand#.' 



Tiiis pall'agc refpefts the fize of animalcules, which the Author 

 reprefents by comparifon with the known fize of a grain of i'and ; 

 other minute objedls which he frequently defcribes, are, the vcfiels 

 in the bodies of infe<51:s, the threads of Spiders, the filaments or 

 threads of wool, the fibres compofing the flefii of animals and the 

 like. All thefe he confiders as of a cylindrical form, that is to fay, 



* ' The folid contents of fpheres bL-ing in the fame proportion as the cubes of their axes, 

 ' the mathematical demonftration of the Author's jiofition is fct down by liim thus: — 

 12 4 10 1728 



12 4 10 64 



