The fifth and last mine mentioned is the Penhsihu Mine, "one of the most promising mines in the nine mining areas in South Manchuria, where the Japanese are permitted by an exchange of Notes between the Chinese and Japanese Governments (May 25, 1915) to prospect for and operate mines. The seam of this mine extends from near Liaoyang to the neighbourhood of Penhsihu, and in size is pronounced equal to the Tayeh mine." It will be observed that this mine, also, was acquired by the Japanese as a result of the ultimatum enforcing the Twenty-one Demands. The _Year Book_ adds: "The Japanese Navy is purchasing some of the Penhsihu output. Osaka ironworks placed an order for 15,000 tons in 1915 and the arsenal at Osaka in the same year accepted a tender for Penhsihu iron." It will be seen from these facts that, as regards iron, the Chinese have allowed the Japanese to acquire a position of vantage from which they can only be ousted with great difficulty. Nevertheless, it is absolutely imperative that the Chinese should develop an iron and steel industry of their own on a large scale. If they do not, they cannot preserve their national independence, their own civilization, or any of the things that make them potentially of value to the world. It should be observed that the chief reason for which the Japanese desire Chinese iron is in order to be able to exploit and tyrannize over China. Confucius, I understand, says nothing about iron mines;[107] therefore the old-fashioned Chinese did not realize the importance of preserving them. Now that they are awake to the situation, it is almost too late. I shall come back later to the question of what can be done. For the present, let us continue our survey of facts. It may be presumed that the population of China will always be mainly agricultural. Tea, silk, raw cotton, grain, the soya bean, etc., are crops in which China excels. In production of raw cotton, China is the third country in the world, India being the first and the United States the second. There is, of course, room for great progress in agriculture, but industry is vital if China is to preserve her national independence, and it is industry that is our present topic.