In 1844, appeared Lund's observations on the caverns of Brazil.
Lund explored as many as 800 caves. In one of them, situated not far from the lake of Semidouro, he found the bones of no less than thirty individuals of the human species, showing a similar state of decomposition to that of the bones of animals which were along with them. Among these animals were an ape, various carnivora, rodents, pachyderms, sloths, &c. From these facts, Lund inferred that man must have been contemporaneous with the megatherium, the mylodon, &c., animals which characterised the quarternary epoch.
Nevertheless, M. Desnoyers, librarian of the Museum of Natural History at Paris, in a very learned article on 'Grottos and Caverns,' published in 1845 in the 'Dictionnaire Universel d'Histoire Naturelle,' still energetically expressed himself in opposition to the hypothesis of the high antiquity of man. But the discoveries continued to go on; and, at the present time, M. Desnoyers himself figures among the partisans of the antediluvian man. He has even gone beyond their opinions, as he forms one among those who would carry back to the tertiary epoch the earliest date of the appearance of our species.
In 1847, M'Enery found in Kent's Hole, a cavern in England, under a layer of stalagmite, the remains of men and antediluvian animals mingled together.
The year 1847 was also marked by the appearance of the first volume of the 'Antiquités Celtiques et Antédiluviennes,' by Boucher de Perthes; this contained about 1600 plates of the objects which had been discovered in the excavations which the author had caused to be made since the year 1836.
The strata at Abbeville, where Boucher de Perthes carried out his researches, belong to the quaternary epoch.
Dr. Rigollot, who had been for ten years one of the most decided opponents of the opinions of Boucher de Perthes, actually himself discovered in 1854 some wrought flints in the quaternary deposits at Saint Acheul, near Amiens, and it was not long before he took his stand under the banner of the Abbeville archæologist.
The fauna of the Amiens deposits is similar to that of the Abbeville beds. The lower deposits of gravel, in which the wrought flints are met with, have been formed by fresh water, and have not undergone either alteration or disturbance. The flints wrought by the hand of man which have been found in them, have in all probability lain there since the epoch of the formation of these deposits—an epoch a little later than the diluvial period. The number of wrought flints which have been taken out of the Abbeville beds is really immense. At Menchecourt, in twenty years, about 100 well-characterised hatchets have been collected; at Saint Gilles twenty very rough, and as many well-made ones; at Moulin-Quignon 150 to 200 well-formed hatchets.
Similar relics of primitive industry have been found also in other localities. In 1853, M. Noulet discovered some in the Infernat Valley (Haute-Garonne); in 1858, the English geologists, Messrs. Prestwich, Falconer, Pengelly, &c., also found some in the lower strata of the Baumann cavern in the Hartz.
To the English geologists whose names we have just mentioned must be attributed the merit of having been the first to bring before the scientific world the due value of the labours of Boucher de Perthes, who had as yet been unsuccessful in obtaining any acceptation of his ideas in France. Dr. Falconer, Vice-president of the Geological Society in London, visited the department of the Somme, in order to study the beds and the objects found in them. After him, Messrs. Prestwich and Evans came three times to Abbeville in the year 1859. They all brought back to England a full conviction of the antiquity and intact state of the beds explored, and also of the existence of man before the deluge of the quaternary epoch.