  Sivin’s account usefully explains why the fact that many records of scientific innovation appear only in the Daoist Canon does not make them inherently Daoist.  The Daoist Canon  (Dao zang 道藏) was first printed in about 1477, and was reprinted in a commercial edition in 1924–1926. The original edition consisted of some 5,305 volumes, on a wide range of subjects, including astronomy and cosmology, biology and botany, medicine and pharmacology, chemistry and mineralogy, and mathematics and physics. Much of the engagement with science after the Han dynasty is relegated the “non-philosophical” texts classified as Dao jiao, and often in ways that obscure the relation between philosophy and science in early China.