this is an awesome topic...
"his grand work, the Astrologia Gallica, took him 30 years to write..."
This is likely NOT due to combustion of Mercury. It's purely accidental. His Sun is in the 12th - the house of imprisonment. As such, his "brightness" or "lucidity", would not see the light of day (pun intended). That it surfaced after 30 years, is problaby due to Cap on the 10th, secondary directions, and transits (as no doubt, he would suggest). Morin's Sun combusts Jupiter and Venus. Saturn, and the Moon are under sunbeams. You have 5 of the remaining six significators in his 12th (since Mercury is on the doorstep).
So, he had a
"high opinion of himself"
- he would have to have had. Mars is literally driving him to complete his work within the confines of his private life. The significators are all applying with the exception of the Moon separating from Mars and Saturn. He seems to me a man of action, and not of substance.
Also, you've the peregrination of Mercury in Aquarius (a wandering yet innovative mind), and NO COMBUSTION since it is Out-of-Sign. Moon and Saturn peregrine in Pisces - trapped in his work, and meandering from job to job... but, he sort of likes this "getting nowhere" (Saturn is in Joy)...
in this case, I would argue, similar to Estebon_Duarte, that Morin "needs help"... if you can map his associates, or rivals to his significators, Bishop of Boulogne, Duke of Luxembourg, Galileo, and Decartes, combustion reveals itself... Jupiter shows his network with clergy, philosophers, etc. (rules Morin's 8th and 9th house cusp), he tried to "burn", and got "burned" by his his consociation... Galileo, and Decartes have pratical contributions, and inventions which stand the test of time, and in some regards, Morin was lead astray by the church...
Speaking of Rene Descartes, his Sun combusts Jupiter, too... you can see that he shared the same monolithic view...
"Morin believed disciplined logic could produce an astrological system..."*
- the difference between the two? is in the "where" do I practice the "disciplined logic"... I wonder what DeBono would say? he who is so clearly in love with his mind, and free from combustion...
"This is a man who once told his friend, Rene Descartes, that he knew as soon as they met, that Descartes' philosophy was flawed"*
- he knew it because he was older, and suffered from the same debility... Sun combust Jupiter...
if I'm Morin, and I'm smart enough to get you to "re-think" astrology, I'm definitely smart enough to "hide my new (astrological) philosophy" (Jupiter combustion) from those who can dissect it...
*
http://www.skyscript.co.uk/morin.html
"It just doesn't follow that it is such a powerful accidental dignity that it overpowers essential dignity. "
Hey Tom,
I look at essential dignity like I would DNA... accidental dignity does not "overpower" per se... you have a predisposition with DNA, and the other is the contribution from environment... for example, if I have the predisposition of a "murderer", and I grow up in the slums of Detroit, and join a gang, I will have opportunity and motive to kill, likely pulling the trigger... if I attend Oxford law, and become a preeminent attorney, and I affect legislation for capital punishment, I kill by jury, and execute it with a stamp and wax seal... in each scenario, it is justified within the context of a particular society, or set of protocols... the act doesn't change... murder is murder...
You're examples are stimulating, and I would like to chime in on your Merc Asc chart...
I'm assuming that Merc is not Retrograde since Mars is ignored... and the Sun is conjunct Polaris which debilitates further than a grand trine with peregrine Moon, and partile South Node...
I liken this to a metaphor of televangelists... if it's combust, you're looking at Jim Bakker, getting caught, and doing time for delivering and living a message that he doesn't believe in... if it's under sunbeams, you got Oral Roberts, who is affected by scandal not of his own, but is guilty by association, and his ministry suffers... if you're Billy Graham, the message is relatively unscathed (btw, his Merc is under sunbeams, and Venus combust in his chart)... it's about the delivery of the message, and not the 'quality' of message itself...
I will actually post a 'real' natal chart with combustion, and would like to discuss a 'real' event from the native's life... it superimposes another combustion from her progressed chart... it may let us arrive at a conclusion regarding the apperceived effectiveness of combustion...