Inn (anc. CEnus), a river of central Europe, one of the principal tributaries of the Danube. It rises in the Swiss canton of Grisons out of the small lake of Longhino, W. of Mount Ber-nina, at an elevation of nearly 7,000 ft. It crosses the Grisons frontier above the gorge of Finstermunz, enters Tyrol by a narrow valley, and runs with great impetuosity through the northern district, particularly the Upper and Lower Inn valleys, to the border of S. E. Bavaria, which it crosses a few miles N. of the fortress of Kufstein. After a course N. and then E. for about 90 m. through Bavaria, it reaches Braunau on the Austrian frontier, whence it flows in a N. direction, forming the boundary between Bavaria and Austria, until it joins the Danube at Passau, after an entire course of 315 m. Navigation begins at Inns-pruck, and becomes considerable below Hall. Steamboats ply on the Inn, and on its largest tributary the Salzach. The beautiful valley of the Engadine, which is situated near the sources and extends along the banks of the Inn, is also called the valley of the Upper Inn, where in the Romansh language, which is spoken by the inhabitants, the name of the river is On.

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Inn, according to judicial decision, " a house where the traveller is furnished with everything which he has occasion for while on his way." It is sometimes important to determine whether a house be an inn and the master an innkeeper, because of the legal rights, on the one hand, and on the other the peculiar and stringent liabilities, of an innkeeper. It is clear that while a sign is the usual and proper evidence that a house is an inn, it is neither essential to an inn nor the only evidence of it. A mere coffee house, or an eating room, is not an inn. Neither is a boarding house; but the distinction between a boarding house and an inn is not always easy, in fact or in law; and it is the more difficult, because the same house may be an inn as to some persons within it, and a boarding house as to others. The best test of this question we apprehend to be the transient-ness or the fixedness of the alleged guest. The old law constantly held that an inn is for the benefit transientium. By this is not meant that a guest of an inn loses his rights, or that the innkeeper loses his rights over him, if the guest remains a long time in the inn, provided he remains there as in an inn; and he does so, if he makes no contract, and comes under no obligation, to stay a moment longer than he chooses to.

If he goes to an inn, occupies his room, and takes his meals, with the right at any moment of going away, and of paying for what he has had up to that moment, and nothing more, he continues to be a guest although he remain there a year or years. But if, upon going there, or at any time afterward, he makes a bargain by force of which he must stay at least so long, whether it be a week or a month, he is no longer a " transient person," and loses the peculiar character of a guest at an inn.