They always keep in pairs, and the largest flock I saw did not consist of more than four such pairs.
Since my first arrival in Iceland I had considered the inhabitants an indolent race of people; to-day I was strengthened in my opinion by the following slight circumstance.

The moorland on which we halted to rest was separated from the adjoining fields of lava by a narrow ditch filled with water.

Across this ditch a few stones and slabs had been laid, to form a kind of bridge.

Now this bridge was so full of holes that the horses could not tell where to plant their feet, and refused obstinately to cross it, so that in the end we were obliged to dismount and lead them across.

We had scarcely passed this place, and sat down to rest, when a caravan of fifteen horses, laden with planks, dried fish, &c.