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On the previous page he says, "Pictet catalogues ninety-eight species of mammals which inhabited Europe in the Post-glacial period. Of these fifty-seven still exist unchanged, and the remainder have disappeared.
For those who, with Agassiz, doubt the specific identity in any of these cases, and those who say, with Pictet, that "the later tertiary deposits contain in general the débris of species very nearly related to those which still exist, belonging to the same genera, but specifically different," may also agree with Pictet that the nearly related species of successive faunas must or may have had "a material connection."
It is surrounded by formations which, though nearly as prominent as itself, have not, with the exception of Pictet on the E., and one on the N.W., called Huggins by Schmidt, received distinctive names. The region W. of Saussure abounds in craterlets, some of which are of the minutest type.
The amount of organic change, as Pictet has remarked, does not strictly correspond with the succession of our geological formations; so that between each two consecutive formations, the forms of life have seldom changed in exactly the same degree. Yet if we compare any but the most closely related formations, all the species will be found to have undergone some change.
The amount of organic change, as Pictet has remarked, does not strictly correspond with the succession of our geological formations; so that between each two consecutive formations, the forms of life have seldom changed in exactly the same degree. Yet if we compare any but the most closely related formations, all the species will be found to have undergone some change.
We see this in the fact that the most eminent palaeontologists, namely, Cuvier, Agassiz, Barrande, Pictet, Falconer, E. Forbes, etc., and all our greatest geologists, as Lyell, Murchison, Sedgwick, etc., have unanimously, often vehemently, maintained the immutability of species.
At length, Professor Wheatstone referred them to the memoir by Professor Pictet, in the Bibliothèque Universelle of Geneva, where that savant improves upon De Saussure's theory, and applies it in its new form to the case of caves containing permanent ice, in tracts whose mean cold is above the freezing point.
Professor Pictet read a paper on these glacières before the Société Helvétique des Sciences Naturelles at Berne, in 1822, which is to be found in the Bibl. Universelle de Genève. M. Pictet left Geneva in the middle of July to visit the caves, but found himself so much knocked up by the first day's work, that he sent on his grandson to the Glacière of the Brezon, and gave up the attempt himself.
Professor Pictet, the celebrated geologist, who also gives his adhesion to these discoveries of M. de Perthes, states that the cave-evidence has by no means been sufficiently valued by geologists, and that there are caverns in Belgium where the existence of human remains cannot be satisfactorily explained on the theory of a modern introduction of them.
If we allow, with Pictet, that Darwin's theory will very well serve for all that concerns the present epoch of the world's history, an epoch which this renowned palaeontologist regards as including the diluvial or quaternary period, then Darwin's first and foremost need in his onward course is a practicable road from this into and through the tertiary period, the intervening region between the comparatively near and the far remote past.
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