Henna is used not only to stain fingernails and cloth for Egyptian mummies, it is also an important dye for hair. It has been used since the days of the pharoahs to add red highlights to dark hair, and to make blonde or gray hair red. The book describes digitalis and digitoxin as popular. I'm using the paperback version and Epilogue is not listed in either table of contents. The only difference in the photos is the dilated pupils in one.
People overwhelmingly choose the one with the dilated pupils.
I hope all you tobacco users will read about the health consequences of your habit. I agree with the author that this is one horrible drug administration method. While the nicotine is addictive but not particularly debilitating, the accompanying tars, aldehydes, and other smoke components are debilitating and even lethal. Maybe the patches and chewing gum administration methods are better than the smoke method of administration. Prescription drugs are horribly expensive.