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
Temple of Castor and Pollux number of known Dioscuri sites remaining from antiquity. Among others, In his 1888 description of the Dioscuri temple in ancient Greek colonial city of Naucratis in Egypt, Ernest Arthur Gardner remarked that such temples were common enough to have a characteristic orientation. Temples to the gods tended to face east. Temples to heroes and demi-gods such as Castor and Pollux faced west. Temple of Castor and Pollux The Temple of Castor and Pollux () is an ancient temple in the Roman Forum, Rome, central Italy. It was originally built in gratitude for victory at the Battle of Lake Regillus (495