The last three volumes of Dr. Christopher's collection of printed newsletters continue to describe the causes and methods of combating disease, the basics of a healthy lifestyle, and ways to cleanse and rejuvenate the body through natural practices. The fifth, sixth and seventh final volumes of his collection of newsletters are the great herbalist John Christopher devoted to the description of 23 herbs: barberry, waxwort, crowberry, black walnut, pharmacy benedict, basil foliage, spear verbena, buckthorn, burdock, cascara sagrada, catnip, cayenne, single-seeded juniper, chickweed, cloves, viburnum, eyebright officinalis, lobelia, dandelion, echinacea, fennel, flax seed, ginger.