84 EFFECTS OF IONIZING RADIATION deposition. For example, clinical studies h shownthat following radium depositionin bi atypical osseous tissue is formed in cancel bone. These formations appearas areas of creased density In roentgenograms (8). It is difficult to interpret the anomaly in pig, described above, and the dense trabect bone in both the pig and chicken. No nor! controls are available for comparison with tl animals, and the history of the animals from time of exposure to the time of collectior not known. Severe dietary changes and dise also produce changes in the pattern of dep tion of osseons tissue, and such changes are of indistinguishable from changes produced exposure to radiation. 5.44 Pathology Sections of lung, liver and tibia, as well thyroid and other endocrine organs of most the fowl and pigs dying spontaneously or s rificed, were prepared. A few patholog: changes were found including an aplastic m row inone duck. However, none of the chan conlddefinitely be ascribed to radiation. S tions of bone examined by Lisco at the .\. also indicated no detectable patholog changes. 5.45 FIGURE 5.3.—Autoradiograph of tibia and femur of baby chick sarrifieed 46 daya poat-detonation CAN). Egg Production in Chickens In birds, extraordinary demands are made the caletum metabolism in the production egy shell, It was, therefore, of particular terest to observe, during the process of egg p duction, the metabolism of those internally posited radioelements which are metabolica similar to caleium. Forty-four days after detonation, a group hens from Rongelap began laying eggs for first time since their collection, During next month and a half, 319 eggs were laid 13 hens. All of the eggs were normal, exci for two eggs from one hen which were | without shells. The shells were compl smooth and of normal shape. The weights the eggs ranged from 30 grams to 64 gral