Daily journal maintained by Alfred T. Mahan while serving aboard the U.S.S. Iroquois on its tour of East Asia. In this journal, Mahan set down his personal rules of conduct which included limits on how much to drink, when to pray, and how much money to save monthly. He would then assess how well he adhered to his self-imposed rules, his work performance, and his relationships with his shipmates. These rules can be found on the inside cover of this volume.

The title page of the volume reads as follows: Alfred T. Mahan Yolohama, Japan April 25th 1868 At sea bound to Hiogo, Japan July 5th 1868 At sea near the Paracel Islands, China Seas January 24th 1869 Looking (nominally) for the H.I.M.S. LeMonge.

This is a typewritten transcription of the journal kept by Mahan while serving on the Iroquois in Japan.