Document wKrNQkKL8DQR0N5mZmzVagVjQ

9 instances where coalescence of lesions has occurred where w | large massive areas of shadows develop in the test Roentgen,- that, that coalescence is due to a complicated tuberculous infection. Yet, there are those cases, with necrosis, with i liqulfaction and indeed with excavation, where we have been unable, with all means at our command, to detect the pres ence of the tubercle bacillus or to see evidence of reaction which characterizes tuberculosis. i Lest we*re led to believe that coalescence and S .I necrosis and liqulfaction may be due to agents or to factors other than Infection, and we have advanced the view that ! i perhaps high local concentrations of dust may be responsi- j ble for some of the necroses, or that the necrosis seen in i these lungs were - with mixed exposure, where there is ?re-: sent carbonization material in large amounts, where snore is present iron oxide in large amounts, that perhaps t.nis necrosis is a specific action for compounds in tne oust, ! other than the free crystalline silica. Is it possible that the carbonation component, that the iron component, 1 may have a power of absorption or adsorption and so *eep i localized the toxic substances, perhaps liberated from tr.e 1 free crystalline silica particles and some dust irritating^ particles which certainly may produce this necrosis. Cer tainly infection is considered - and I mention that - in fection other than may produce tuberculosis, is a : jss i. it7 SEVENTH SARANAC -0229