The core of this book is a word-for-word copy of Raphael's Mundane Astrology. To this, Jain adds horary notes, principally in delineation of zodiacal signs (much expanded from Raphael, for no good reason): Capricorn Places signified: barren, brushy, thorny places, fallow ground, etc. In the expanded section on planets, to Raphael's text, Jain adds rulership, exaltation, detriment & fall, as well as keywords (for sun: power, vitality, self-expression) & natal descriptions (for sun, superior or proud & haughty persons.... "good": deal with superiors, solicit assistance, grant favours..., etc.), which is natal writing. "Dealing with superiors" has nothing to do with mundane astrology.
Jain includes Pluto & the nodes (missing entirely from Raphael, as would be expected). Of course by this time the reader, unsure if Jain wrote anything of his own, is searching his library for the horary source. Pluto is not a nice-seeming planet, but apparently we need his influence to 'round out' our lives - natal writing, and not very good at that.