The larvae of the genus Rhyacionia are feeders on the buds and new growth of various species of pines, forming resinous exudations ; but never pitch nodules as in the genus Petrova. We find in the literature mention of a ...

The use of the softer grades of stone, particularly steatite, in the manufacture of ornaments, by the pre-historic Indians of southern California is well known. However, the use of fluorspar or fluorite, as a similar ...