Ere long we may be able to traverse a census in its details of record and deduction, and thus satisfy a reasonable curiosity, especially as to the last reported total after the carnage of the rebellion. On the other hand, it may be stated that in the last census, the entire population of Manchuria, Koko-nor, Ílí, and Mongolia, is estimated at only 2,167,286 persons, and nearly all the inhabitants of those vast regions are subject to the Emperor. The population of Tibet is not included in any census, its people not being taxable. It is doubtful if an enumeration of any part of the extra provincial territory has ever been taken, inasmuch as the Mongol tribes, and still less the Usbeck or other Moslem races, are unused to such a thing, and would not be numbered. Yet, the Chinese cannot be charged with exaggeration, when good judges, as Klaproth and others, reckon the whole at between six and seven millions; and Khoten alone, one author states, has three and a half millions. No writer of importance estimates the inhabitants of these regions as high as thirty millions--as does R. Mont. Martin--which would be more than ten to a square mile, excluding Gobi; while Siberia (though not so well peopled) has only 3,611,300 persons on an area of 2,649,600 square miles, or 1-1/3 to each square mile. The reasons just given why the Chinese desire posterity are not all those which have favored national increase. The uninterrupted peace which the country enjoyed between the years 1700 and 1850 operated to greatly develop its resources. Every encouragement has been given to all classes to multiply and fill the land. Polygamy, slavery, and prostitution, three social evils which check increase, have been circumscribed in their effects. Early betrothment and poverty do much to prevent the first; female slaves can be and are usually married; while public prostitution is reduced by a separation of the sexes and early marriages. No fears of overpassing the supply of food restrain the people from rearing families, though the Emperor Kienlung issued a proclamation in 1793, calling upon all ranks of his subjects to economize the gifts of heaven, lest, erelong, the people exceed the means of subsistence.