The 19th book was a supplement of a similar nature, likely of new compositions and was added later. The 143 hymns of the 20th book of Atharvaveda Samhita is almost entirely borrowed from the Rigveda. The hymns of Atharvaveda cover a motley of topics, across its twenty books. Roughly, the first seven books focus primarily on magical poems for all sorts of healing and sorcery, and Michael Witzel states these are reminiscent of Germanic and Hittite sorcery stanzas, and may likely be the oldest section. Books 8 to 12 are speculations of a variety of topics, while Books 13 to 18 tend to be about life cycle rites of passage rituals. The Srautasutra texts and the are attached to the Atharvaveda Shaunaka edition, as are a supplement of Atharvan Prayascitthas, two Pratishakhyas, and a collection of Parisisthas. For the Paippalada edition of Atharvaveda, corresponding texts were Agastya and Paithinasi Sutras but these are lost or yet to be discovered. Contents The Atharvaveda is sometimes called the "Veda of magical formulas", an epithet declared to be incorrect by other scholars. The Samhita layer of the text likely represents a developing 2nd millennium BCE tradition of magico-religious rites to address superstitious anxiety, spells to remove maladies believed to be caused by demons, and herbs- and nature-derived potions as medicine. Many books of the Atharvaveda Samhita are dedicated to rituals without magic and to theosophy. The text, states Kenneth Zysk, is one of oldest surviving record of the evolutionary practices in religious medicine and reveals the "earliest forms of folk healing of Indo-European antiquity". The Atharvaveda Samhita contains hymns many of which were charms, magic spells and incantations meant to be pronounced by the person who seeks some benefit, or more often by a sorcerer who would say it on his or her behalf. The most frequent goal of these hymns, charms, and spells were long life of a loved one or recovery from some illness. In these cases, the affected would be given substances such as a plant (leaf, seed, root) and an amulet. Some magic spells were for soldiers going to war with the goal of defeating the enemy, others for anxious lovers seeking to remove rivals or to attract the lover who is less than interested, some for success at a sporting event, in economic activity, for bounty of cattle and crops, or removal of petty pest bothering a household.