IRRELEVANT EVIDENCE. That which does not support the issue, and which) of course, must be excluded. See Relevant.

IRREPLEVISABLE, practice. This term is applied to those things which cannot legally be replevied. For example, in Pennsylvania no goods seized in execution or for taxes, can be replevied.

IRRESISTIBLE FORCE. This term is applied to such an interposition of human agency, as is, from its nature and power, absolutely uncontrollable; as the inroads of a hostile army. Story on Bailm. 25; Lois des Batim. pt. 2. c. 2, 1. It differs from inevitable accident; (q. v.) the latter being the effect of physical causes, as, lightning, storms, and the like.

IREVOCABLE. That which cannot be revoked.

2. A will may at all times be revoked by the same person who made it, he having a disposing mind; but the moment the testator is rendered incapable to make a will he can no longer revoke a former will, because he wants a disposing mind. Letters of attorney are generally revocable; but when made for a valuable consideration they become irrevocable. 7 Ves. jr. 28; 1 Caines' Cas. in Er. 16; Bac. Ab. Authority, E. Vide duthority; License; Revocation.

IRRIGATION. The act of wetting or moist ening the ground by artificial means.

2. The owner of land over which there is a current stream, is, as such, the proprietor of the current. 4 Mason's R. 400. It seems the riparian proprietor may avail himself of the river for irrigation, provided the river be not thereby materially lessened, and the water absorbed be imperceptible or trifling. Ang. W. C. 34; and vide 1 Root's R. 535; 8 Greenl. R. 266; 2 Conn. R. 584; 2 Swift's Syst. 87; 7 Mass. R. 136; 13 Mass. R. 420; 1 Swift's Dig. 111; 5 Pick. R. 175; 9 Pick. 59; 6 Bing. R. 379; 5 Esp. R. 56; 2 Conn. R. 584; Ham. N. P. 199; 2 Chit. Bl. Com. 403, n. 7; 22 Vin. Ab. 525; 1 Vin. Ab. 657; Bac. Ab. Action on the case, F. The French law coincides with our own. 1 Lois des BŠtimens, sect. 1, art. 3, page 21.

IRRITANCY. In Scotland, it is the happening of a condition or event by which a charter, contract or other deed, to which a clause irritant is annexed, becomes void. Ersk. Inst. B. 2, t. 5, n. 25. Irritancy is a kind of forfeiture. It is legal or conventional. Burt. Man. P. R. 29 8.