Some of those tribes, grouped together in the Indian Census under the denominational rubric of "Animists" and numbering about 8-1/2 millions, have survived to the present day in remote hills and jungles without being absorbed into the Hindu social system, and have preserved their primitive beliefs, in which fetish worship, and magic are the dominant elements.
Low as is their social _status_, it is but little lower than that of the Panchamas who have obtained a footing on the nethermost rung of the social ladder of Hinduism without being admitted to any sort of contact with its higher civilization or even to the threshold of its temples.
Hinduism with all its rigidity is, it is true, sufficiently elastic to sanction, at least tacitly, a slow process of evolution by which the Panchama castes--for there are many castes even amongst the "untouchables"-- gradually shake off to some extent the slough of "uncleanness" and establish some sort of ill-defined relations even with Brahmanism.

For whilst there is on the one hand a slowly ascending scale by which the Panchamas may ultimately hope to smuggle themselves in amongst the inferior Sudras, the lowest of the four "clean" castes, so there is a descending scale by which Brahmans, under the pressure of poverty or disrepute, sink to so low a place in Brahmanism that they are willing to lend their ministrations, at a price, to the more prosperous of the Panchamas and help them on their way to a higher _status_.

Thus probably half the Sudras of the present day were at some more or less remote period Panchamas.

Again, during periods of great civil commotion, as in the 18th century, when brute force was supreme, not a few Panchamas, especially low-caste Mahrattas, made their way to the front as soldiers of fortune, and even carved out kingdoms to themselves at the point of the sword.

Orthodox Hinduism bowed in such cases to the accomplished fact, just as it has acquiesced in later years when education and the equality of treatment brought by British rule have enabled a small number of Panchamas to qualify for employment under Government.
But these exceptions are so rare and the evolutionary process is so infinitely slow and laborious that they do not visibly affect the yawning gulf between the "clean" higher-caste Hindu and the "unclean" Panchama.