Mr. Frazer does not here pretend to guess why the bisection occurred.
The 'bisection' of his theory could not, I fear, be 'gradual.'
Bacteria increase by bisection, and when the surrounding conditions are favorable their rate of production is marvellous.
Before the bisection is motion; after the bisection is rest.
Or were totem names given, nobody knows why, to the two phratries ...