Your mileage may vary with this book, which is about 90% trip report and 10% philosophy/science/spiritual speculation, especially since many of Dunlap's visions uncannily replicate Disney's Fantasia. While the details of color and such tend to bleed together, Dunlap does manage to make the descriptions meaningful to me, even if I don't share her spiritual proclivities. That said, I was impressed with Dunlap's open-heartedness and down-to-earth prose, which, despite the fact that any hallucinogenic experience is at heart unintelligible, manages to describe altered states on LSD pretty well. It's enough to make me want to give one more chance on a drug I've found amusing at best, deeply uncomfortable at worst.
I learned that Jane Dunlap was the pseudonym of Adelle Davis only after I read this book and was quite surprised. At the time she volunteered for experimental testing, LSD was found only in research labs and military/spy agencies, so there is no taint of counterculture influence here. A very scientifically-oriented set of observations recorded after each experience and little to no indication that they were fearful.
When I read this I did not know that author Jane Dunlap, was actually health advocate Adelle Davis, who I had read and bought many of her "Let's Eat Healthy", "Let's Stay Healthy" and so on.
Later, reading other books by Leary and others, I too shared her praise for this "inner experience".