He would not be more astonished than would the ancient eohippus on meeting with a modern dray-horse.
eohippus, the dawn horse, is the name given a skeleton found in 1880 in the lower Eocene strata in Wyoming.
In the Lower Eocene are found the remains of a diminutive ungulate (eohippus), of the stature of a moderately-sized dog.
The oldest of these creatures that lead to the horses is called eohippus or beginning horse.
Orohippus was but little larger than eohippus, and in most other respects very similar.
The earliest stage that we can trace with certainty, in this line of descent, is found in the eohippus of Marsh.