So, in a chart of a prostitute the Part of Honesty should met the following conditions: be placed in a cardinal sign, with a malefic planet aspecting without reception, with no aspect from a benefic planet or from the planets with dignities in her sign. Very simple!

I randomly took 3 charts of prostitutes from Astro-Databank (Rodden Rating A): 

First example is Prostitute 7995, born on 30 June 1937 at 00:12 (= 12:12 AM ) in Toronto, Canada (43n39, 79w23).

I found the Part of Honesty at 16 degrees in Taurus, in a fixed sign, in conjunction with Venus (ruler) so in reception and aspect with benefic. None of the conditions mentioned by Bonatti for prostitution are accomplished. Result: the Part of Honesty is not relevant.

Second example is Prostitute 9212, born on 23 September 1942 at 21:30 (= 9:30 PM), in Lima OH, USA (40n44, 84w06).

I found Part of Honesty at 11 degree in Scorpio, in a fixed sign, in sextile with Venus (a benefic), with no aspect from a malefic planet. None of the conditions mentioned by Bonatti for prostitution are accomplished. Result: the Part of Honesty is not relevant.

Third example is Prostitute 9448, born on 29 July 1943 at 07:00 (= 07:00 AM ), in Houston TX, USA (29n45, 95w21).

I found Part of Honesty at 20 degree in Libra, in a cardinal sign, in trine with Saturn (reception by the ruler), in an aspect with a malefic (Saturn) but with reception. Only one condition mentioned by Bonatti is met. Result: the Part of Honesty is not relevant.

You can easily see that the results are not good, so my scepticism still remains.

In the last chapters the author advices us how to use the parts on sinastry charts, horary figures, mundane figures and commodities variation.

MY EVALUATION: 7,1

Conclusion.The book treats a delicate and controversial subject. A technique, easy to calculate and apply, which is not generally used nowadays because astrologers don't understand it or don't believe in her reliability. This book, written in 1980, tries to cover this lack of confidence with some metaphysical explanations, a translation from Bonatti's treatise on the astrological parts and a few examples.

It seems a simple construction. The central part is the translation from Bonatti preceded by theory and followed by the practical examples. But, when you read it, the situation becomes more complicated. Especially in the first part many ideas and theories are not linked together, seems to be taken from different books and quickly compiled. The author didn't spent enough time to revise the text, to give him some fluidity and clearance. Or, maybe he didn't succeed to express well enough in words what he wanted to say. Maybe he hasn't the ability, the talent to write a book. Anyway, taking in account the subject, which is not very popular, few people will have the patience to read the whole book. 

My opinion is that The Arabic Parts in Astrology - A Lost Key to Prediction is neither a bad book, nor a good one. Is a mediocre one. A book where you'll find useful information and ideas together with the formulas needed to compute the entire series of astrological parts. A book which can't be the real guide expected to enlighten your path through the mysterious world of the Arabic parts. My evaluation is 7,1.