DIATOMACEOUS SILICOSIS
DIATOMACEOUS EARTH SILICOSIS BY ENRICOC. VIGLIANIandGIACOMOMOTTURA Fromthe ClinicforOccupationalDiseases, University ofMilan, andfromthePathologicalInstitute, University ofPisa (RECEIVED FOR PUBLICATION, MARCH 31, 1948) Diatomaceous earth and tripoli are hydrated amorphous silica minerals oforganic origin, which are generally considered to be a variety of opal.