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Cattle.   5 5

Travellers might well turn the theory to account on their own behalf; they are well situated for testing its truthfulness, by observing the practices of the countries in which they are travelling. Reliable facts upon the extreme distances that can be travelled over, day after day, by people carrying different loads, but equally circumstanced in every other respect, would be very acceptable to me.

The formulae are as follow:

Let b be the burden which would just suffice to prevent an animal from moving a step ; d the distance he could travel daily if unloaded. Also, let b' be some burden less than b ; and let d' be the distance to which he could travel daily when carrying b'.

Then b' d2 = b(d - d')2.   (1)

Again, the " useful effect " is a maximum, if b' d' is a maxi



When this is the case, then

b' = b.



3d' = d.


In other words, an animal gets through most work in the day if he carries 9 of the greatest load he could just stagger under ; in which case he will be able to travel 3 of the distance he could walk if he carried no load at all. (Machinery requires no repose ; and therefore d, the distance per day, is convertible into v, the velocity of movement.)

As an example: -Suppose a man is able to walk 10 miles a day, with a load of 130 lbs., and 33 miles a day when he carries nothing. Then, from equation (1), the value of b (the burden under which he would be brought to a standstill) would be about 267.1; and the best load for him, from equation (2), would be 119 lbs., which he would be able to carry, according to equation (3), 11 miles a day.

Horses.-The mode of taking wild horses is by throwing the lasso, whilst pursuing them at full speed, and dropping a noose over their necks, by which their speed is soon checked, and they are choked down.

Mr. Rarey's sixpenny book tells all that can be told on the subject of horse-breaking ; but far more lies in the skill and