. Tribune popular science . deposit. Name of Compara-animaL (in size. PprrsvY/Tiin frontof the i ye. Number Toes tTuit(/ :i>,\-< four/I tinto foot. ground. eocene oroliippus fox none 4 front. 3 hind all midpcne nuoliippm slie< p none 3 h all mioeene anchitheriam sheep deep 3 each* all pliocene niiciii ass deep 3 each 1 each pliooeie pliohippiu nes very deep 1each 1 each quaternary tquus horse none 1 each 1 each SKULL OF THE IIIPPAKION. In the Flioccno we also find the Pliohippus—or atleast Prof. Marsh does. It has a deep depressionunder the eye. It and the Ilipparion about
. Tribune popular science . deposit. Name of Compara-animaL (in size. PprrsvY/Tiin frontof the i ye. Number Toes tTuit(/ :i>,\-< four/I tinto foot. ground. eocene oroliippus fox none 4 front. 3 hind all midpcne nuoliippm slie< p none 3 h all mioeene anchitheriam sheep deep 3 each* all pliocene niiciii ass deep 3 each 1 each pliooeie pliohippiu nes very deep 1each 1 each quaternary tquus horse none 1 each 1 each SKULL OF THE IIIPPAKION. In the Flioccno we also find the Pliohippus—or atleast Prof. Marsh does. It has a deep depressionunder the eye. It and the Ilipparion about equalthe ass in Inght. The Pliohippus has but one toe—that is, its foot is like the modern SKULL, OF THE MODERN HORSE. Lastly, at the very top of tho pliocene whTe it is passing into the quaternary,for the first time tho bones of the true horse arefound. It equaled in size the horse of the presentday, an 1 in some species surpassed it. The exist inirhorse haa DO depression in front of tho orbit. Occa-sionally it has a supcrtluoiis hoof hanging about thetrue one. There are many other facts of a similar characterabout these skeletons those of other connate forme, all indicative of a series, of progression, oras the beln \ i i^ in that theory would call it, of do-\elopment. In respect to the toes the argumentmaybe briefly stated thus: The single-toed hoofrepresents the highest capacity for speed; four toesmight be useful for support iu the marshes, but tho necessity for speed would sooner or later make ani-mals with fewer superllusus toes take precedenceof the others. The reduction in the number of toeamav in this manner be due to the gradual elevationan
Size: 2202px × 1134px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1874
