Bark (botany) rope, used for example in the rigging of Viking age longships. Among the commercial products made from bark are cork, cinnamon, quinine (from the bark of Cinchona) and aspirin (from the bark of willow trees). The bark of some trees notably oak ("Quercus robur") is a source of tannic acid, which is used in tanning. Bark chips generated as a by-product of lumber production are often used in bark mulch in western North America. Bark is important to the horticultural industry since in shredded form it is used for plants that do not thrive in ordinary soil, such as epiphytes.
The Making of the Pentateuch resulted in many inconsistencies and repetitious stories, which could be analysed through the methodology of source criticism to reconstruct the original documents. Wellhausen had concentrated exclusively on the written text of the Pentateuch, but in the next generation Hermann Gunkel developed form criticism, a methodology which he claimed could identify the various genres which had contributed to the text and thus reconstruct its tradition history. Gunkel and his followers, notably Martin Noth, used this new methodology to discover the oral sagas which formed the basis of the written texts of the Pentateuch. By the middle of the 20th century, Wellhausen's