is bound to make their meaning as clear as possible (In re
Etherington and Lancashire and Yorkshire Accident and Insurance Co. (1) ). Since estoppel is not mentioned and "waiver" is, and since it would, from the very nature of estoppel, have been absurd, even if legally possible (as to which we offer no opinion), to agree
INSURANCE in advance that estoppel should not arise, under any circumstances,
except where admitted in writing, we are bound here to limit the word "waiver" to its own strict legal connotation. "A waiver must be an intentional act with knowledge" " (per Lord Chelmsford L.C. in Earl of Darnley v. Proprietors &. of London, Chatham and Dover Railway (2) ). First, "some distinct act ought to be done to constitute a waiver" (per Parke B. in Doe d. Nash v. Birch (3) and per Williams J. in Perry v. Davis (4); next, it must be "intentional," that is, such as either expressly or by imputation of law indicates intention to treat the matter as if the condition did not exist or as if the forfeiture or breach of condition had not occurred and, lastly, it must be "with knowledge," an essential supported by many authorities, from Pennant's Case (5) and down to Matthews v. Smallwood (6). "Waiver" is a doctrine of some arbitrariness introduced by the law to prevent a man in certain circumstances from taking up two inconsistent positions (see per James L.J. in Pilcher v. Rawlins (7) ). It is a conclusion of law when the necessary facts are established. It looks, how- ever, chiefly to the conduct and position of the person who is said to have waived, in order to see whether he has "approbated" so as to prevent him from 'reprobating "--in English terms, whether he has elected to get some advantage to which he would not otherwise have been entitled, SO as to deny to him a later election to the contrary (see per Lord Shaw in Pitman v. Crum Ewing (8) ). His knowledge is necessary, or he cannot be said to have approbated or elected.
These observations are necessary in order to bring into contrast the inherent nature of estoppel by conduct. The facts of a given case are SO often open to the application of either doctrine, and so
(I) (1909) I K.B., 591, at p. 600.
(5) 2 Co., 171, at p. 173. (2) L.R. 2 H.L., 43, at p. 57.
(6) (1910) 1 Ch., 777. (3) 1 M. &W., 402, at p. 406.
(7) 7 Ch. App., 259, at pp. 268 et seqq. (4) 3 C.B. (N.S.), 769, at p. 777.
(8) (1911) A.C., 217, at p. 239.