Over most of the range of the beaver, the object of the "chief engineer of the animal realm" in building dams is to provide water of sufficient depth in which to build a proper house.
(the object of the "chief engineer of the animal realm" in building dams; is; to provide water of sufficient depth; T:Over most of the range of the beaver)
the object of the "chief engineer of the animal realm" in building dams
is
to provide water of sufficient depth T:Over most of the range of the beaver