Yamaka is the sixth book of Abhidhamma. This book is in ten chapters, each dealing with a particular topic of Buddhist teaching: Roots (Mula), Aggregates (Khanda), Bases (Ayatana), Elements (Dhatu), Truths (Sacca/Satya), Formations (Sankhara/Sanskara), Latent States (Anusaya), Consciousness (Citta/Chitta), Phenomena (Dhamma) and Sense Faculties (Indriya).
Colophon:
[The writing of this manuscript] was completed on the ninth waxing-moon day of the third [lunar] month, the first day of the week, at the horn time.
Other notes:
This date corresponds with Monday, 8 December 1845 (1207 Margasirsha 9).