The ox-carts are often made with solid wheels, for greater strength.
Now, if you acquire an ox, a new source of energy, you can plow more.
If an ox were his property, and he wished to get needles and thread at the store, he thought it would be inconvenient and impossible soon to go on mortgaging some portion of the creature each time to that amount.
He was responsible for all care, must restore ox for ox, sheep for sheep, must breed them satisfactorily.
In common with an allied ruminant from the same district, previously described as Euceratherium, it seems probable that Preptoceras is related on the one hand to the musk-ox, and on the other to the Asiatic takin, while it is also supposed to have affinities with the sheep. If these extinct forms really serve to connect the takin with the musk-ox, their systematic importance will be very great.