Note 35 — Chapter I · METHOD AND DIVISIONS.

But our information is not always very complete; and so it is not always clear to what extent subsistence is derived from agriculture. In such cases we shall make use of some secondary characteristics. Some facts may be recorded from which we can more or less safely draw conclusions as to the place agriculture occupies. The facts indicative of the first stage of agriculture are: 1. Women only are occupied in agriculture35, 2. The tribe is very mobile, habitations are often shifted. Those indicative of the second, as distinguished from the first, stage are: 1. The tribe has fixed habitations (except where this is due to an abundance of fish or fruit-bearing trees), 2. The lands are irrigated. Those indicative of the third stage are: 1. The lands are manured, 2. Rotation of crops is carried on, 3. Domestic animals are used in agriculture, 4. Agricultural products are exported.