[New data on the presence of submicroscopic crystalline particles in lung dusts]

Investigation of dusts, isolated from the lungs of decreased miners, has contributed much to the elucidation of the pathogenesis of dust-induced. Numerous theoretical and experimental investigations have been carried out in this field, but there are problems, which are still far from being well understood. One of these is the implication of particles less than 0,5 micron, reckoned by many authors among the air contaminators. In this report data are given on the cristal structure of particles, for which electron difraction and X-ray microanalysis have shown that they have the mineral composition of the bed, where the miner has worked.