I'm assuming you mean the book "Hidden Root's of Aikido" by Omiya. I posted some comments about this and several other books on another thread in this forum.

IMHO, "Daito-ryu Aikijujutsu: Conversations with Daito-ryu Masters" edited by Stanley Pranin is really the best book on Daito-ryu available in the States in English.

Brently Keen