Petrography lower if wholly or partly vitreous. The specific gravity of the more common rocks range from about 2.5 to 3.2. Archaeologists use petrography to identify mineral components in pottery. This information ties the artifacts to geological areas where the raw materials for the pottery were obtained. In addition to clay, potters often used rock fragments, usually called "temper" or "aplastics", to modify the clay's properties. The geological information obtained from the pottery components provides insight into how potters selected and used local and non-local resources. Archaeologists are able to determine whether pottery found in a particular location was locally produced
What Is Art? Aylmer Maude, translator of many of Tolstoy's writings, calls it "probably the most masterly of all Tolstoy's works", citing the difficulty of the subject matter and its clarity. For a comprehensive review of the reception at the time of publication, see Maude 1901"b". Bayley, John (1986 [1966]). ""What is Art?" - excerpt from Tolstoy and the Novel" in Bloom, Harold (ed.). Leo Tolstoy. New York: Chelsea House. p. 141-152. Jahn, Gary R. (1975). "The aesthetic theory of Leo Tolstoy's "What is Art?"". "Journal of Aesthetics and Art Criticism" 34 (1): 59-65. Maude, Aylmer (1901a). “"What is Art?" - An Introduction”,