A knowledge of the facts regarding the Japanese population in California is important, because it has been a point of sharp dispute between those who insist on exclusion and those who oppose it, the former arguing that the Japanese are increasing at an amazing rate through immigration, smuggling, and birth, threatening to overwhelm the white population in the State, the latter contending that they are not multiplying in a way menacing to the State of California. The fact that such a dispute prevails in the matter of the number of Japanese suggests that it is, at least, one of the crucial points on which the whole problem rests. This is true in the sense that, if the Japanese in California were decreasing in number as the American Indians are, it would be totally useless to waste energy in an attempt to quicken the final extinction. If, on the other hand, they were to multiply in a progressively higher rate so as to overwhelm the white population, it would certainly be serious both for California and for the United States. Number of Japanese in California. This being the case, it is but natural that the enemies of the Japanese should exaggerate the number of Japanese living in California. The leaders of the movement for excluding Japanese estimate their number as no less than one hundred thousand. The report of the State Board of Control of California, prepared for the specific purpose of emphasizing the gravity of the Japanese problem in California, enumerated the population of Japanese in that State at the end of December, 1919, as 87,279. This number turned out to be 13,355 higher than the number reported by the Foreign Office of Japan,[11] which was based on the Consular registrations (including American-born offspring of the Japanese) and the count made by the Japanese Association of America. Most fortunately, the preliminary publication of a part of the United States Census for 1920 removed the uncertainty arising from the discrepancy by stating the exact number of the Japanese in California to be 70,196. The possible cause of the over-estimation by the Board of Control is to be found in its method of computation. Instead of counting the actual number of residents, it simply added the number of net gain from immigration and the excess in birth over death statistics to the returns of the census of 1910, overlooking the fact that in the meantime a great number of Japanese were leaving California for Japan as well as other States of the Union. The present number of Japanese is a minor matter compared with its dynamic tendency. The rate of increase of the Japanese population in California in the past may be easily obtained by comparing the returns of the United States Census. The following table indicates the number and rate of decennial increase: NUMBER OF JAPANESE IN CALIFORNIA ACCORDING TO THE UNITED STATES CENSUS.