what are the symptoms of the condition mentioned earlier, where there is an excess of oxygen in body tissues?
Associated with hyperoxia is an increased level of reactive oxygen species (ROS), which are chemically reactive molecules containing oxygen. The occurrence of irritation, congestion and edema of the lungs, and even death following prolonged exposures.
Hyperoxia
Associated with hyperoxia is an increased level of reactive oxygen species (ROS), which are chemically reactive molecules containing oxygen. 
what happens when you have to much oxygen The result of breathing increased partial pressures of oxygen is hyperoxia, an excess of oxygen in body tissues how does oxygen become toxic? It results rom the harmful effects of breathing molecular oxygen at increased partial pressures. Oxygen toxicity is a concern for underwater divers, those on high concentrations of supplemental oxygen (particularly premature babies), and those undergoing hyperbaric oxygen therapy. how does this toxicity affect the human lung? An inflammation that starts in the airways leading to the lungs and then spreads into the lungs (tracheobronchial tree). The symptoms appear in the upper chest region (substernal and carinal regions). were there any physicians/doctors who studied this phenomenon? Central nervous system toxicity was first described by Paul Bert. when did he do this study? 1878 were any of his works prejudiced against races? Yes,  his book "La Deuxième année d'enseignement scientifique"   claimed that "European whites" are far superior and more intelligent than blacks, people from Asian, and Native Americans, among others. has he written any other books? UNANSWERABLE when was he born? Auxerre (Yonne)
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Hyperoxia [SEP] Signs and symptoms
Associated with hyperoxia is an increased level of reactive oxygen species (ROS), which are chemically reactive molecules containing oxygen. These oxygen containing molecules can damage lipids, proteins, and nucleic acids, and react with surrounding biological tissues. The human body has naturally occurring antioxidants to combat reactive molecules, but the protective antioxidant defenses can become depleted by abundant reactive oxygen species, resulting in oxidation of the tissues and organs. The symptoms produced from breathing high concentrations of oxygen for extended periods have been studied in a variety of animals, such as frogs, turtles, pigeons, mice, rats, guinea pigs, cats, dogs and monkeys.