The (moon-)month has originally nothing to do with the year and the seasons: this must be clearly and definitely recognised. The months may be reckoned independently of the year; nothing hinders us from counting up to twenty or a hundred months. But most peoples, before they have developed a definite system of time-reckoning, can count no farther than ten at most, and in the time-reckoning the counting is of course always the latest and most abstract stage. Such an enumeration of the months may commence at any point of the year and be continued _ad libitum_; in relation to the year it is not fixed but shifting. Both series, the years and the months, are enumerated without reference to one another, as our days of the week in relation to the year, the days of the week falling on different dates in different years. The month however is a shorter period easy to survey, and such divisions are necessary in order to split up the too long period of the year. In itself the month has nothing to do with the year, nor does it exactly fit into the year (12 × 29½, about 355 days). It is impossible to combine the months with the year without doing violence to the one or the other. The time-reckoning of the modern civilised peoples has chosen this latter expedient. The month has become a conventional sub-division of the year; it is quite independent of the moon, and keeps as reminders of its origin only its name and a length approximating to that of the moon’s revolution. This has come about because the moon, unlike the sun and the seasons depending thereon, has no immediate influence upon the events and occupations of our lives. We have therefore come back from the reckoning in moons to the purely solar year. It was quite otherwise with the primitive peoples, whose time-reckoning was so concrete. For them the moon afforded the only fixed measure of the duration of time: its appearance impressed itself firmly upon the mind. These peoples therefore, even at an advanced stage of development, have tried to adjust the year by the moon, which could only be done by adopting years of varying length, of 12 and 13 months respectively. How this lunisolar reckoning has arisen, it will be the object of the following chapters to investigate. I begin by setting forth the somewhat copious material for series of months. For the peoples of North Asia I have hitherto been able to make hardly any statements: the works are for the most part written in Russian, and are for that reason inaccessible to me. For the names of months, however, abundant material is accessible.