concentration of nutriment in the food that is used. Slaughter animals
carry themselves; but the cattle-watchers swell the list of those who
have to be fed.

Means of Transport.--In order to transport the articles belonging to an
expedition across a wild and unknown country, we may estimate as
follows:--

Beasts of burthen:--

An ass will not usually care more than about (net weight) 65 lbs.
A small mule 90
A horse 100
An ox of an average greed 120
A camel (which rarely can be used by an explorer) 300

It is very inconvenient to take more than six pack-animals in a caravan
that has to pass over broken country, for so much time is lost by the
whole party in re-adjusting the packs of each member of it, whenever one
gets loose, that its progress is seriously retarded.

Carriages.--An animal--camels always excepted--draws upon wheels in a
wild country about two and a half times the weight he can carry.

lbs.
A light cart, exclusive of the driver, should not carry
more than..................................................800
A light waggon, such as one or two horses would trot
away with, along a turnpike road, not more than...........1500
A waggon of the strongest construction, not more than.........3000