Kol Bo
Kol Bo (, 'all is in it') is a collection of Jewish ritual and civil laws. Its author has not yet been ascertained. The work in content resembles other codes, as, for instance, the Orḥot Ḥayyim, though in its form it is very different. Its contents and peculiarities The Kol Bo does not pretend to any order; the laws that were later arranged in Orach Hayyim are found together with those that were later arranged in Yoreh De'ah and Even haEzer. Likewise, many laws are entirely missing in the Kol Bo. It is peculiar also in that some of the laws are briefly stated, while others are stated at great length, without division into paragraphs. After the regular code, terminating with the laws of mourning (No. 115), there comes a miscellaneous collection, containing the "takkanot" of R. Gershom and of Rabbeinu Tam, the Ma'aseh Torah of Judah haNasi, the legend of Solomon's throne, the legend of Joshua b. Levi, a kabbalistic dissertation on brit milah, a dissertation on gematria and noṭariḳon, 61 decisions of Eliezer ben Nathan; 44 decisions of Tashbetz, decisions of Isaac of Corbeil, and responsa of Peretz ha-Kohen, decisions of Isaac Orbil, of the geonim Naṭronai, Hai