from
Bouvier's Law Dictionary, Revised 6th Ed (1856)
INDIVISIBLE. That which cannot be separated.
2. It is important to ascertain when a consideration or a contract, is
or is not indivisible. When a consideration is entire and indivisible, and
it is against law, the contract is void in toto. 11 Verm. 592; 2 W. & S.
235. When the consideration is divisible, and part of it is illegal, the
contract is void only pro tanto.
3.-To ascertain whether a contract is divisible or indivisible, id to
ascertain whether it may or may not be enforced, in part, or paid in part,
without the consent of the other party. See 1 Bouv. Inst. n. 694, and
articles Divisible; Entire.