The first book which Rabbi Avraham Yitzchak HaCohen Kook published in order to awaken those who put on the Tefillin shel Rosh in the wrong place, it was published anonymously, with a hint which appears on the title page – “By CD”Y” – Cohen Da’ato Yafe. In his father-in-law’s approbation at the beginning of the book the Aderet reveals that the author is his son-in-law Rabbi Kook Av Beit Din of Zeimels. 48 [1] pages. 17 cm. A few reinforcements. Fine condition.