These--which might be classed, according to the terms used in Greek architecture, as astyle, when having no pillars; distyle, when with two pillars in each face; tetrastyle, with four; and hexastyle with six--form the leading and most characteristic division of these excavations, and with slight modification are to be found in all the modern series. The forms, however, of many are so various and so abnormal, that it would require a far more extended classification to enable us to describe and include them all. In many instances the great depth of the cave which this square arrangement required was felt to be inconvenient; and a more oblong form was adopted, as in the Durbar cave at Salsette (Woodcut No. 77), where, besides, the sanctuary is projected forward, and assists, with the pillars, to support the roof. In some examples this is carried even further, and the sanctuary, standing boldly forward to the centre of the hall, forms in reality the only support. This, however, is a late arrangement, and must be considered more as an economical than an architectural improvement. Indeed by it the dignity and beauty of the whole composition are almost entirely destroyed. [Illustration: 77. Durbar Cave, Salsette. (From a Plan by the Author.) Scale 50 ft. to 1 in.] NASSICK VIHARAS. The two most interesting series of caves for the investigation of the history of the later developments of the Vihara system, are those at Nassick and Ajunta. The latter is by far the most extensive, consisting of twenty-six first-class caves, four of which are chaityas. The latter group numbers, it is true, seventeen excavations, but only six or seven of these can be called first-class, and it possesses only one chaitya. The others are small excavations of no particular merit or interest. Ajunta has also the advantage of retaining the greater portion of the paintings which once adorned the walls of all viharas erected subsequently to the Christian Era, while these have almost entirely disappeared at Nassick, though there seems very little doubt that the walls of all the greater viharas there were once so ornamented. This indeed was one of the great distinctions between them and the earlier primitive cells of the monks before the Christian Era. The Buddhist church between Asoka and Kanishka was in the same position as that of Christianity between Constantine and Gregory the Great. It was the last-named pontiff who inaugurated the Middle Ages with all their pomp and ceremonial. It might, therefore, under certain circumstances be expedient to describe the Ajunta viharas first; but they are singularly deficient in well-preserved inscriptions containing recognisable names. Nassick, on the other hand, is peculiarly rich in this respect, and the history of the series can be made out with very tolerable approximative certainty.[179]