His major contribution to Jewish scholarship was
Keter Shem Tob, an encyclopaedic treatise which examines and compares the rites, ceremonies and liturgy of the eastern and western Sephardim and Ashkenazim, paying particular attention to the customs of Spanish and Portuguese Jews. The first two volumes were published in 1934. The final work comprised a total of 7 volumes, the last 4 of which were published posthumously with the help of his son, Rabbi Dr. Maurice Gaguine. In 1998 "Keter Shem Tob" was republished as a complete set. His other works were: •
Pirke Shirah, 1937 (poems and special prayers) •
Jews of Cochin, 1953 • Various articles on talmudic, theological and legal subjects in the
Jewish Chronicle,
Jewish Guardian,
Jewish World,
World Jewry,
Jewish Tribune (India),
Israel’s Messenger (China),
Rosh Hashana Annual (South Africa) etc. •
Shulhan Aruch, a critical study based on several old editions and unpublished manuscripts. • Six
Responsa • Sermons •
Rambles in Spain, synagogal inscriptions and local Jewish customs. • Various commentaries on
Midrash Rabbah and
Midrash Tanchuma. A significant bulk of his responsa, sermons, and other works was never published, and they remain in manuscript or lost. He was also the editor of "Yehudith" (organ of the Montefiore College). (For further information, see
Jewish Encyclopedia,
Encyclopaedia Judaica and
Ozar Israel.) ==References==