Marchesvan, coinciding as it does with the rainy season in Palestine, is considered a pure Hebrew term. The modern Jews consider it a compound word, from mar, drop, and Chesvan; the former betokening that it was wet, and the latter being the proper name of the month. Hence the name indicates the wet month. In the second place we have the names of six others which appear in the Bible subsequently to the Babylonian captivity, viz.: Sivan, the third; Elul, the sixth; Kislev, the ninth; Tebet, the tenth; Sebat, the eleventh, and Adar, the twelfth. There are two other months whose names do not appear in the Bible, viz.: Tamuz, the fourth, and Ab, the fifth. The name of the intercalary month is called Ve-Adar, or 2d Adar because placed in the calendar after Adar and before Nisan. Dr. Smith says these names are probably borrowed from the Syrians in whose regular calendar we find names answering to most of them. He also says it was the opinion of the Talmudists, that these names were introduced by the Jews who returned from the Babylonish captivity, and also that they are certainly used exclusively by writers of the post-Babylonian period. Inasmuch as the Hebrew months coincided with the seasons, as we have already shown, it follows as a matter of course, that an additional month must have been inserted every third year, which would bring the number up to thirteen. No notice, however, is taken of this month in the Bible, neither have we reason to think that it was inserted according to any exact rule, but it was added whenever it was discovered that the barley harvest did not coincide with the ordinary return of the month Abib. It has already been shown that in the modern Jewish calendar the intercalary month is introduced seven times in nineteen years, according to the Metonic, or lunar cycle which was adopted by the Jews about 360 A. D.