These methods are the following:

1. By hunting wild animals in a state of nature.

2. By rearing tame animals in pasturages.

3. By gathering fruits and vegetables which grow spontaneously in a state of nature.

4. By rearing fruits and grains and other vegetables by artificial tillage in cultivated ground.

By the two former methods man subsists on animal food. By the two latter on vegetable food.

As we go north, from the temperate regions toward the poles, man is found to subsist more and more on animal food. This seems to be the intention of Providence. In the arctic regions scarcely any vegetables grow that are fit for human food, but animals whose flesh is nutritious and adapted to the use of man are abundant.

As we go south, from temperate regions toward the equator, man is found to subsist more and more on vegetable food. This, too, seems to be the intention of nature. Within the tropics scarcely any animals live that are fit for human food; while fruits, roots, and other vegetable productions which are nutritious and adapted to the use of man are abundant.

In accordance with this difference in the productions of the different regions of the earth, there seems to be a difference in the constitutions of the races of men formed to inhabit them. The tribes that inhabit Greenland and Kamtschatka can not preserve their accustomed health and vigor on any other than animal food. If put upon a diet of vegetables they soon begin to pine away. The reverse is true of the vegetable-eaters of the tropics. They preserve their health and strength well on a diet of rice, or bread-fruit, or bananas, and would undoubtedly be made sick by being fed on the flesh of walruses, seals, and white bears.

In the temperate regions the productions of the above-mentioned extremes are mingled. Here many animals whose flesh is fit for human food live and thrive, and here grows, too, a vast variety of nutritious fruits, and roots, and seeds. The physical constitution of the various races of men that inhabit these regions is modified accordingly. In the temperate climes men can live on vegetable food, or on animal food, or on both. The constitution differs, too, in different individuals, and it changes at different periods of the year. Some persons require more of animal, and others more of vegetable food, to preserve their bodily and mental powers in the best condition, and each one observes a change in himself in passing from winter to summer. In the summer the desire for a diet of fruits and vegetables seems to come northward with the sun, and in the winter the appetite for flesh comes southward from the arctic regions with the cold.

When we consider the different conditions in which the different regions of the earth are placed in respect to their capacity of production for animal and vegetable food, we shall see that this adjustment of the constitution of man, both to the differences of climate and to the changes of the seasons, is a very wise and beneficent arrangement of Divine Providence. To confine man absolutely either to animal or vegetable food would be to depopulate a large part of the earth.

It results from these general facts in respect to the distribution of the supplies of animal and vegetable food for man in different latitudes that, in all northern climes in our hemisphere, men living in a savage state must be hunters, while those that live near the equator must depend for their subsistence on fruits and roots growing wild. When, moreover, any tribe or race of men in either of these localities take the first steps toward civilization, they begin, in the one case, by taming animals, and rearing them in flocks and herds; and, in the other case, by saving the seeds of food-producing plants, and cultivating them by artificial tillage in inclosed and private fields. This last is the condition of all the half-civilized tribes of the tropical regions of the earth, whereas the former prevails in all the northern temperate and arctic regions, as far to the northward as domesticated animals can live.

From time immemorial, the whole interior of the continent of Asia has been inhabited by tribes and nations that have taken this one step in the advance toward civilization, but have gone no farther. They live, not, like the Indians in North America, by hunting wild beasts, but by rearing and pasturing flocks and herds of animals that they have tamed. These animals feed, of course, on grass and herbage; and, as grass and herbage can only grow on open ground, the forests have gradually disappeared, and the country has for ages consisted of great grassy plains, or of smooth hill-sides covered with verdure. Over these plains, or along the river valleys, wander the different tribes of which these pastoral nations are composed, living in tents, or in frail huts almost equally movable, and driving their flocks and herds before them from one pasture-ground to another, according as the condition of the grass, or that of the springs and streams of water, may require.

We obtain a pretty distinct idea of the nature of this pastoral life, and of the manners and customs, and the domestic constitution to which it gives rise, in the accounts given us in the Old Testament of Abraham and Lot, and of their wanderings with their flocks and herds over the country lying between the Euphrates and the Mediterranean Sea. They lived in tents, in order that they might remove their habitations the more easily from place to place in following their flocks and herds to different pasture-grounds. Their wealth consisted almost wholly in these flocks and herds, the land being almost every where common. Sometimes, when two parties traveling together came to a fertile and well-watered district, their herdsmen and followers were disposed to contend for the privilege of feeding their flocks upon it, and the contention would often lead to a quarrel and combat, if it had not been settled by an amicable agreement on the part of the chieftains.

The father of a family was the legislator and ruler of it, and his sons, with their wives, and his son's sons, remained with him, sometimes for many years, sharing his means of subsistence, submiting to his authority, and going with him from place to place, with all his flocks and herds. They employed, too, so many herdsmen, and other servants and followers, as to form, in many cases, quite an extended community, and sometimes, in case of hostilities with any other wandering tribe, a single patriarch could send forth from his own domestic circle a force of several hundred armed men. Such a company as this, when moving across the country on its way from one region of pasturage to another, appeared like an immense caravan on its march, and when settled at an encampment the tents formed quite a little town.

Whenever the head of one of these wandering families died, the tendency was not for the members of the community to separate, but to keep together, and allow the oldest son to take the father’s place as chieftain and ruler. This was necessary for defense, as of course, such communities as these were in perpetual danger of coming into collision with other communities roaming about like themselves over the same regions. It would necessarily result, too, from the circumstances of the case, that a strong and well-managed party, with an able and sagacious chieftain at the head of it, would attract other and weaker parties to join it; or on the arising of some pretext for a quarrel, would make war upon it and conquer it. Thus, in process of time, small nations, as it were, would be formed, which would continue united and strong as long as the able leadership continued; and then they would separate into their original elements, which elements would be formed again into other combinations.

Such, substantially, was pastoral life in the beginning. In process of time, of course, the tribes banded together became larger and larger. Some few towns and cities were built as places for the manufacture of implements and arms, or as resting-places for the caravans of merchants in conveying from place to place such articles as were bought and sold. But these places were comparatively few and unimportant. A pastoral and roaming life continued to be the destiny of the great mass of the people. And this state of things, which was commenced on the banks of the Euphrates before the time of Abraham, spread through the whole breadth of Asia, from the Mediterranean Sea to the Pacific Ocean, and has continued with very little change from those early periods to the present time.

Of the various chieftains that have from time to time risen to command among these shepherd nations but little is known, for very few and very scanty records have been kept of the history of any of them. Some of them have been famous as conquerors, and have acquired very extended dominions. The most celebrated of all is perhaps Genghis Khan, the hero of this history. He came upon the stage more than three thousand years after the time of the great prototype of his class, the Patriarch Abraham.