This text is missing some spaces, please add them: Thisviewmaybetrue,andyetmayneverbecapableoffullproof.Seeing,forinstance,thattheoldestknownmammals,reptiles,andfishesstrictlybelongtotheirproperclasses,thoughsomeoftheseoldformsareinaslightdegreelessdistinctfromeachotherthanarethetypicalmembersofthesamegroupsatthepresentday,itwouldbevaintolookforanimalshavingthecommonembryologicalcharacteroftheVertebrata,untilbedsrichinfossilsarediscoveredfarbeneaththelowestSilurianstratum—adiscoveryofwhichthechanceissmall.
This view may be true, and yet may never be capable of full proof. Seeing, for instance, that the oldest known mammals, reptiles, and fishes strictly belong to their proper classes, though some of these old forms are in a slight degree less distinct from each other than are the typical members of the same groups at the present day, it would be vain to look for animals having the common embryological character of the Vertebrata, until beds rich in fossils are discovered far beneath the lowest Silurian stratum—a discovery of which the chance is small.
This text is missing some spaces, please add them: Veryniceand100%original.
Very nice and 100% original.
This text is missing some spaces, please add them: Itisresistanttochemicalprocedurestakingplaceinthemouthcavity.Tissue-friendly,resistanttocorrosion.
It is resistant to chemical procedures taking place in the mouth cavity. Tissue-friendly, resistant to corrosion.