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Jubilee. This was instituted in 1300 by Boniface VIII., who pleaded a popular tradition for its celebration every hundredth year, though no written evidence could be found. Clement VI. shortened the period to 50 years (1350): it was then further reduced to 33, and again in 1475 to 25 years.

See also the article on Luther. The latest and fullest authority on this subject is Dr H. C. Lea, Hist, of Auricular Confession and Indulgences in the Latin Church (Philadelphia, 1896); his standpoint is frankly non-Catholic, but he gives ample materials for judgment. The greatest orthodox authority is Eusebius Amort, De Origine, &c., indulgentiarum (1735). More popular and more easily accessible are Father Thurston’s The Holy Year of Jubilee (1900), and an article by the Bishop of Newport in the Nineteenth Century for January 1901, with a reply by Mr Herbert Paul in the next number.  (G. G. Co.) 

INDULINES, a series of dyestuffs of blue, bluish-red or black shades, formed by the interaction of para-amino azo compounds with primary monamines in the presence of a small quantity of a mineral acid. They were first discovered in 1863 (English patent 3307) by J. Dale and H. Caro, and since then have been examined by many chemists (see O. N. Witt, Ber., 1884, 17, p. 74; O. Fischer and E. Hepp, Ann., 1890, 256, pp. 233 et seq.; F. Kehrmann, Ber., 1891, 24, pp. 584, 2167 et seq.). They are derivatives of the eurhodines (aminophenazines, aminonaphthophenazines), and by means of their diazo derivatives can be de-amidated, yielding in this way azonium salts; consequently they may be considered as amidated azonium salts. The first reaction giving a clue to their constitution was the isolation of the intermediate azophenin by O. Witt (Jour. Chem. Soc., 1883, 43, p. 115), which was proved by Fischer and Hepp to be dianilidoquinone dianil, a similar intermediate compound being found shortly afterwards in the naphthalene series. Azophenin, C30H24N4, is prepared by warming quinone dianil with aniline; by melting together quinone, aniline and aniline hydrochloride; or by the action of aniline on para-nitrosophenol or para-nitrosodiphenylamine. The indulines are prepared as mentioned above from aminoazo compounds:

NH2⋅C6H4N2⋅C6H5+C6H5NH2→HN:C6H3LangleIT.svg N—— Rangle.svgC6H4,

or by condensing oxy- and amido-quinones with phenylated ortho-diamines (F. Kehrmann, Ber., 1895, 28, p. 1714):

HO RangleIB.svgC6H2LangleIT.svg O + H2N Rangle.svg C6H4= 2H2O + O RangleIT.svgC6H2LangleIB.svg N·C6H5 Rangle.svgC6H4.

The indulines may be subdivided into the following groups:— (1) benzindulines, derivatives of phenazine; (2) isorosindulines; and (3) rosindulines, both derived from naphthophenazine; and (4) naphthindulines, derived from naphthazine.

NH:C6H3LangleIT.svg N—— Rangle.svgC6H4NH:C6H3LangleIT.svg N—— Rangle.svgC10H6
N·C6H5 N·C6H5
I. Benzindulines. II. Isorosindulines.
NH:C10H5LangleIT.svg N—— Rangle.svgC6H4NH:C10H5LangleIT.svg N—— Rangle.svgC10H6
N·C6H5 N·C6H5
III. Rosindulines. IV. Naphthindulines.

The rosindulines and naphthindulines have a strongly basic character, and their salts possess a marked red colour and fluorescence. Benzinduline (aposafranine), C18H13N3, is a strong base, but cannot be diazotized, unless it be dissolved in concentrated mineral acids. When warmed with aniline it yields anilido-aposafranine, which may also be obtained by the direct oxidation of ortho-aminodiphenylamine. Isorosinduline is obtained from quinone dichlorimide and phenyl-β-naphthylamine; rosinduline from benzene-azo-α-naphthylamine and aniline and naphthinduline from benzene-azo-α-naphthylamine and naphthylamine.

INDULT (Lat. indultum, from indulgere, grant, concede, allow), a, papal licence which authorizes the doing of something not sanctioned by the common law of the church; thus by an indult the pope authorizes a bishop to grant certain relaxations during the Lenten fast according to the necessities of the situation, climate, &c., of his diocese.

INDUNA, a Zulu-Bantu word for an officer or head of a regiment among the Kaffir (Zulu-Xosa) tribes of South Africa. It is formed from the inflexional prefix in and duna, a lord or master. Indunas originally obtained and retained their rank and authority by personal bravery and skill in war, and often proved a menace to their nominal lord. Where, under British influence, the purely military system of government among the Kaffir tribes has broken down or been modified, indunas are now administrators rather than warriors. They sit in a consultative gathering known as an indaba, and discuss the civil and military affairs of their tribe.

INDUS, one of the three greatest rivers of northern India.

A considerable accession of exact geographical knowledge has been gained of the upper reaches of the river Indus and its tributaries during those military and political movements which have been so constant on the northern In the Himalaya. frontiers of India of recent years. The sources of the Indus are to be traced to the glaciers of the great Kailas group of peaks in 32° 20′ N. and 81° E., which overlook the Mansarowar lake and the sources of the Brahmaputra, the Sutlej and the Gogra to the south-east. Three great affluents, flowing north-west, unite in about 80° E. to form the main stream, all of them, so far as we know at present, derived from the Kailas glaciers. Of these the northern tributary points the road from Ladakh to the Jhalung goldfields, and the southern, or Gar, forms a link in the great Janglam—the Tibetan trade route—which connects Ladakh with Lhasa and Lhasa with China. Gartok (about 50 m. from the source of this southern head of the Indus) is an important point on this trade route, and is now made accessible to Indian traders by treaty with Tibet and China. At Leh, the Ladakh capital, the river has already pursued an almost even north-westerly course for 300 m., except for a remarkable divergence to the south-west which carries it across, or through, the Ladakh range to follow the same course on the southern side that had been maintained on the north. This very remarkable instance of transverse drainage across a main mountain axis occurs in 79° E., about 100 m. above Leh. For another 230 m., in a north-westerly direction, the Indus pursues a comparatively gentle and placid course over its sandy bed between the giant chains of Ladakh to the north and Zaskar (the main “snowy range” of the Himalaya) to the south, amidst an array of mountain scenery which, for the majesty of sheer altitude, is unmatched by any in the world. Then the river takes up the waters of the Shyok from the north (a tributary nearly as great as itself), having already captured the Zasvar from the south, together with innumerable minor glacier-fed streams. The Shyok is an important feature in The Shyok affluent. Trans-Himalayan hydrography. Rising near the southern foot of the well-known Karakoram pass on the high road between Ladakh and Kashgar, it first drains the southern slopes of the Karakoram range, and then breaks across the axis of the Muztagh chain (of which the Karakoram is now recognized as a subsidiary extension northwards) ere bending north-westwards to run a parallel course to the Indus for 150 m. before its junction with that river. The combined streams still hold on their north-westerly trend for another 100 m., deep hidden under the shadow of a vast array of snow-crowned summits, until they arrive within sight of the Rakapushi peak which pierces the north-western sky midway between Gilgit and Hunza. Here the great change of direction to the south-west occurs, which is thereafter maintained till the Indus reaches the ocean. At this point it receives the Gilgit river from the north-west, having dropped The Gilgit affluent. from 15,000 to 4000 ft. (at the junction of the rivers) after about 500 m. of mountain descent through the independent provinces of northern Kashmir. (See Gilgit.) A few miles below the junction it passes Bunji, and from that point to a point beyond Chilas (50 m. below Bunji) it runs within the sphere of British interests. Then once again it resumes its “independent” course through the wild mountains of Kohistan and Hazara, receiving tribute from both sides (the Buner contribution being the most noteworthy) till it emerges into the plains of the Punjab below Darband, in 34° 10′ N. All this part of the river has been mapped in more or less detail of late years. The hidden strongholds of those Hindostani fanatics who had found a refuge on its banks since