I just come here and i already seem to be, like, a fountain of imformation for you guys:
1) Honorius told Bartimaeus he was a "Afrit of the ninth level" Judging by the tone that seems to be the highest rank. Bartimaeus is said to be a middling Djinni; which further supports this.
2) Bartimaeus was clearly metontioned as
"Linnean ranking: Four, Dangerous." The keyword is linnean ranking. That suggests more ranking systems. Lovelace said Bartimaeus was
"a djinni of the fourteenth level" which, i think cements it. Confused? Me too.
3) Djinn, Foliots and Afrits are all taken from Islamic mythology. (See: answers.com) Marids are said to be god-like spirits of water. and i'm inclined to agree with that.
Conclusion:WE NEED A FOURTH BOOK!!
Do i sound obseesed?
Shame of the Super Son