| Denmark | 600,000 | 6 | 24 | .25 | | Belgium | 1,300,000 | 18 | 5 | .2 | | Portugal | 770,000 | 3.5 | 8 | .15 | | Holland | 560,000 | 7 | ? | .1 | | Great Britain | 3,000,000 | 4 | 3 | .07 | +------------------+-------------+------------+------------+------------+ These data exhibit considerable differences, since the percentage of the forest area varies from 3.5 to 50, and the area per head of population from .07 to 9.5 acres. Russia, Sweden and Norway may as yet have more forest than they require for their own population. On the other hand, Great Britain and Ireland, Germany, Denmark, Portugal, Holland, and even Belgium, France and Italy have not a sufficient forest area to meet their own requirements; at the same time, they are all sea-bound countries, and importation is easy, while most of them are under the influence of moist sea winds, which reduces to a subordinate position the importance of forests for climatic reasons. Intimately connected with the area of forests in a country is the state of ownership--whether they belong to the state, corporations or to private persons. Where, apart from the financial aspect and the supply of work, forests are not required for the sake of their indirect effects, and where importation from other countries is easy and assured, the government of the country need not, as a rule, trouble itself to maintain or acquire forests. Where the reverse conditions exist, and especially where the cost of transport over long distances becomes prohibitive, a wise administration will take measures to assure the maintenance of a suitable proportion of the country under forest. This can be done either by maintaining or constituting a suitable area of state forests, or by exercising a certain amount of control over corporation and even private forests. Such measures are more called for in continental countries than in those which are sea-bound, as is proved by the above statistics. _Supply of Timber--Imports and Exports._--The following table shows the net imports and exports of European countries (average data, calculated from the returns of recent years).