The first and foremost cause is Japan's limited and unresourceful land. The land area of Japan Proper is 147,655 square miles, which is about 8,000 square miles less than that of California. The terrain of Japan is mountainous and volcanic, being traversed by two chains of mountains. One runs down from Saghalien towards the center of Honshu and the other from China via Formosa headed towards the north, both meeting at the middle of Honshu, thereby producing rugged upheavals popularly known as "the Japanese Alps." Being thus rocky and mountainous, the area contains a very small portion of plain land. Hokkaido, the extreme northern island, has seven plains. Honshu, the main island, has between the mountains five small plains, and Kyushu, the large southern island, has one. The total area of plains forms about one fourth of the entire area of Japan. The consequence of this geological formation is that about 16 per cent. of the total area is fit for cultivation, while over 70 per cent. of it is made up of mountains and forests. Agriculture. The Japanese having always been primarily farmers, agriculture still remains the principal occupation of the people. More than half the population is earning a livelihood wholly or partially by agricultural pursuits. The large number of farmers and the small amount of agricultural land allotted to them has given rise to the most intensive cultivation, which probably has no parallel in the world. Nearly five and a half million families, or thirty million people, cultivate fifteen million acres, which means less than three acres per family, and half an acre per individual farmer. It is little wonder that the law of diminishing return has long been operating, rendering the agricultural pursuit less and less remunerative, driving farm hands to industry and other work. The average daily wage of the farm laborer was 56 sen in 1917, while that of the industrial laborer was 1 yen.[4] In recent years the Government undertook a thorough examination of the tillable land in the country and reported as a result that there is yet a possibility of reclaiming about five million acres. By way of experiment, the Government began, with the approval of the 41st Session of the Diet (1918-19), to undertake the work of partial reclamation of seven hundred thousand acres on a nine-year program, with an outlay of some four million yen. It is yet uncertain how the enterprise will turn out; but it is fairly doubtful, in view of the fact that already the land is utilized almost to the limit of cultivation, including narrow back yards and rugged hillsides, as well as sandy beach, whether the program can materially increase the present amount of farm acreage.