On the other hand, we are in no wise bound to minimise the significance of the tropical element, in number as well as in influence, as regards the formation of the Japanese people. The remarkable differences in distance make it very natural to suppose that the immigrants from the tropical regions might have been less numerous than those from the north. Still it is not utterly improbable that a pretty substantial number of the Southerners might have come over into Japan, drifted over not only by the current but by the wind also, sometimes in groups, sometimes sporadically, and that they could subdue the inhabitants by force of martial courage yet unenervated and not by that of a superior civilisation only. The main difficulty in establishing this assertion lies in the fact that it is not quite certain whether they were really brave and heroic enough to achieve such a conquest. As to the linguistic consideration which is the favourite resort of many ethnologists it can be said that it is not more harmful to the one hypothesis than it is advantageous to the other. It is quite needless to argue that there is little sign of the existence of any linguistic affinity between the language of Japan and those of the tropical lands, except in a few words. This lack of linguistic affinity, however, can be explained away, while maintaining the importance of the ancient immigrants from the South, by considering that the ancestors of the ruling class, having been inferior as regards civilisation to the other stock or stocks of people whom they found already settled prior to them in Japan, and having been perhaps inferior in number also, gradually lost not only their language but many of their racial characteristics as well. Similar examples may be found in abundance in the history of Europe, the Normans in Sicily, and the Goths in Italy being among the most conspicuous. It is not impossible to suppose the like process to have taken place in Japan also.
Summing up what is stated above, I cannot but think that the prehistoric immigrants into our country from the South were by no means a negligible factor in constituting the island nation, though the majority of immigrants might have come from the nearest continental shores, and in this majority it is not necessary to exclude the Chinese element altogether. It seems to me probable that southern Japan, especially the island of Kyushu, was inhabited in the prehistoric age by the Ainu, and by immigrants from the North as well as from the South side by side. But what was the relative distribution of these agglomerate races at a certain precise date is now a question very hard to settle definitely.
CHAPTER III
JAPAN BEFORE THE INTRODUCTION OF BUDDHISM AND CHINESE CIVILISATION
Before entering into a description of the early history of Japan, it may be of some service to the foreign reader to learn when the authentic history of Japan begins. Generally it is not an easy matter to draw a distinct line of demarcation between the historic and the prehistoric age in the history of any country, and in order to get rid of this difficulty, an intermediate age called the proto-historic was invented by modern scholars, and has been in vogue up to now. It is true that, by making use of this term, one aim was surely attained, but two difficulties were thereby created in lieu of one dismissed. We were freed, indeed from the hard task of making a delicate discrimination between the historic and the prehistoric age, but at the same time we took up the burden of distinguishing the proto-historic age from both the historic and the prehistoric! And these new difficulties cannot be said to be easier to meet than the old, so that it may be doubted whether it was wise to intercalate the proto-historic age between the two, if the promotion of scientific exactitude was the main purpose of such an intercalation. A polygon, however the number of its sides be augmented, can never make a circle in the exact sense. I shall not, therefore, try to adhere scrupulously to the above-mentioned threefold division in discharging the task which I have undertaken.
Let me turn then to the line of demarcation between the historic and the prehistoric age without troubling myself about the proto-historic. This line must be drawn by first making clear the signification of the historic age, and not by defining the term "prehistoric." What, then is the historic age? It may be defined as an age, the authentic history of which can, in a large measure, be ascertained, or as an age which has an historical record, contemporary and fairly reliable. It is to be regretted that we cannot dispense with such precautionary expressions as 'to a large measure' and 'fairly', but we cannot avoid retaining them, and therein lies the true difficulty of making an exact demarcation. Moreover, an age, the history of which was regarded at one time as impossible of being ascertained, often may become ascertainable as the result of ever-increasing discoveries of new materials as well as of the new methods of their deciphering. In other words, the demarcation, however conscientiously made at one time, is liable to be shifting, and the reason for the demarcation gradually changes pari passu. As the word prehistoric has now begun to be used independently of 'historic', the historic age may be better defined as an age which has a civilisation advanced enough to have a record of its own. So far a country may be said to be in an historic age, even at an epoch the historical sources of which are considered not to be extant anywhere, only if the standard of civilisation be high enough for that. Unless we adopt this definition, the line of demarcation may shift more and more into antiquity, as the result of ever-increasing discoveries of new materials as well as of the methods of their interpretation, and the demarcation itself will become of very little value. So far a country may be said to be in an historic age, even at an epoch the historical sources of which are considered not to be extant anywhere. But how can we know whether a country has reached a stage of civilisation advanced enough to have its own record? It is almost impossible to discover this point without resorting to authentic historical sources. And in order that we may so resort, those sources must be extant. In this way if we want to make the demarcation full of significance, we have to beg the question ad infinitum.
In the history of Japan, too, what is said above holds true, and the demarcation, however dexterously made, will not assist much in the study of it. Among foreigners, however, the question how far can we go back with certainty in the history of Japan, is a very popular topic, and has been discussed with very keen interest. For the sake of elucidation, therefore, I will give a short account of the early chronicles concerning the history of our country.
Among the old chronicles of Japan there are two which are especially conspicuous. The one is the Kojiki, the other the Nihongi. It is generally admitted that these two chronicles are the oldest extant and the most substantial of all the historical sources of ancient Japan. The compilation of the former was concluded in 712 A.D. by a savant called Oh-no-Yasumaro, while that of the latter was undertaken by several royal historiographers, and finished in 720 A.D. under the auspices of Prince Toneri. That the compilation of the two great chronicles took place successively in the beginning of the eighth century is one of the symptoms showing the dawning of the national consciousness of the Japanese, to which I shall refer in the following chapters. In their characteristics, these two chronicles differ somewhat from each other. The materials of the Kojiki were first made legible and compiled by Hieta-no-Are, an intelligent courtier in the reign of the Emperor Temmu, and afterwards revised by the aforesaid Oh-no-Yasumaro. Considering that there was only a very short time left at the disposal of Yasumaro to spend in revising the work before dedicating it to the Empress Gemmyo, it can be safely concluded that Yasumaro did not try to make any great alteration, and the Kojiki remained for the most part as it had been compiled by Hieta-no-Are.