Agates worked by the hand of man are found in great quantities in the bone beds of the Godavery. Some javelin heads in sandstone, basalt, and quartz, with scrapers and knives, most of them flat on one side and rounded on the other, appear to be even more ancient than the agate implements. Some of the celts resemble those of European type, others the flint weapons found in Egypt, and the clumsiest forms may be compared to those still in use amongst the natives of Australia. We may also mention a somewhat rare type lately discovered in the island of Melas, which have been characterized as saw-bladed knives. A letter from Rivett-Carnac announces the discovery of weapons and stone implements in Banda, a wild mountain district on the northwest of India. The scrapers, he says, strangely resemble those of the Esquimaux, and the arrow-heads those of the most ancient inhabitants of America.34 Many megalithic monuments are met with in places widely removed from each other in the vast Indian Empire. Captain Congreve, after describing the cairns with their rows of stones ranged in circles, the kistvaens or dolmens, the huge rocks placed erect as at Stonehenge, the barrows hollowed out of the cliffs, declares with undisguised astonishment that there is not a Druidical monument of which he had not seen the counterpart in the Neilgherry Mountains.35 General Faidherbe divides Africa into two distinct regions—one north of the Great Desert, where the inhabitants and the fauna and flora have all alike certain characteristics in common with those of Europe; and the other south of the Sahara, which was at one time separated from that in the north by a vast inland sea. In this southern region we are in Nigritia, or the Africa of the negroes, where the inhabitants in their physical characteristics and in their language, the mammals, and the plants, differ altogether from those of the north. In one point, however, these two regions resemble each other: in both we recognize a Stone age, which existed in Algeria and in Egypt, as well as on the banks of the Senegal and at the Cape of Good Hope. The valley of the Nile from Cairo to Assouan has yielded a series of objects in flint, porphyry, and hornblendic rock, retaining traces of human workmanship, and reminding us of similar implements of European type. These objects,36 says M. Arcelin, are always found either beneath modern deposits or at the surface of the upper plateaux at the highest point to which the river rises; nothing has, however, been found in the alluvial deposits of the Nile, in spite of the most persevering search. At the Prehistoric Congress held at Stockholm, some worked flints were produced that had been found in the Libyan Desert. This once inhabited district, now without water or vegetation, can only be reached at the present day with the greatest difficulty. Is not this yet another proof of the great changes which have taken place since the advent of man?