Salicylaldehyde be prepared from the corresponding phenol by the Duff reaction, or by treatment with paraformaldehyde in the presence of magnesium chloride and a base. Salicylaldehyde was identified as a characteristic aroma component of buckwheat. It is also one of the components of castoreum, the exudate from the castor sacs of the mature North American beaver ("Castor canadensis") and the European beaver ("Castor fiber"), used in perfumery. Furthermore, salicylaldehyde occurs in the larval defensive secretions of several leaf beetle species that belong the subtribe Chrysomelina. An example for a leaf beetle species that produces salicylaldehyde is the red poplar leaf beetle
Castor and Pollux the appearance of James son of Zebedee and his brother John who appear in the narrative by Mark the Evangelist. MacDonald cites the origin of this identification to 1913 when J. Rendel Harris published his work Boanerges, a Greek version probably of an Aramaic name meaning "Sons of Thunder", thunder being associated with Zeus, father of Pollux, in what MacDonald calls a form of early Christian Dioscurism. More directly, the Acts of the Apostles mentions the Dioskouroi in a neutral context, as the figurehead of an Alexandrian ship boarded by Paul in Malta (Acts 28:11). Castor and Pollux Castor and