but as men thus advanced, the very facts opened the way for them and joined in forcing them to investigate the subject. However true it may be that all generation and destruction proceed from some one or (for that matter) from more elements, why does this happen and what is the cause?
eta zentzu horretan aurrera egin ahala, arazoak berak hedatu zien bidea eta bilaketan jarraitzera behartu: genesi eta usteldura guztiak printzipio batetik-edo bat baino 20) gehiagotik-gertatzen direla egia bada, zergatik gertatzen da hau, eta zein da kausa?