’Part’means1athatintowhichaquantumcaninanywaybe
divided；forthatwhichistakenfromaquantumquaquantumis
alwayscalledapartofit，e。g。twoiscalledinasenseapartof
three。Itmeansb，ofthepartsinthefirstsense，onlythosewhich
measurethewhole；thisiswhytwo，thoughinonesenseitis，in