Sha'arey Taharah" Manuscript by Rabbi Yichya Tzalach – Yemen

Manuscript, Sefer Sha'arey Taharah, about Niddah. By Rabbi Yichya Tzalach. Yemen, [1810?].
Title of manuscript reads: "this book… by Av-Beit-Din Sana'a… Yichya Tzalach". [Essay printed in Jerusalem, 1894].
At the end are final words and a colophon. These were probably copied from the original manuscript, since at the beginning the author is mentioned as already dead, Rabbi Saleh died in 1805. [Writing shape and kind of paper are typical of the 1800's. The titles also are in accordance with Rabbi Salach's period, hence the assumption that this manuscript is of c. 1810].
Jewish-Arabic, Hebrew letters.
28 pages, 16.5 cm. Heavy dark paper, fair condition, moisture stains. Slight damages.