BARIUM 211 



for measurement after evaporation; in others, tlie tissues were ashed 

 directly in the capsules (probably porcelain) in which the counts were 

 made. In a study with hornets the distrilnition of ingested Ba'"" was 

 followed by routine counting of dissected organs and autoradiography 

 (Ba-3). The autoradiograms were prepared by mounting histological 

 sections on the photographic emulsions and, after exposure and develop- 

 ment, by mounting under a cover slip with 75 per cent glycerin. Similar 

 techniques were emploj^ed to follow the uptake and distribution of Ba^*" 

 and La^"'" in larvae of Drosophila rcplda (Ba-4). The larvae were grown 

 on food enriched with the radioisotope ; the shape of the decay curves was 

 used to ascertain selective utilization by the organism. The plant uptake 

 of Ba^^" was studied, using applications of 18 ^c in 3 to 4 kg of soil in a 

 No. 10 can (Ba-5). 



Ba-l. Crandall, Lathan A., Jr. : The Absorption of Barium Sulfate and Non-absorption 

 of Zirconium Dioxide from the Gastrointestinal Tract, Gastroenterology, 13 : 

 513-526 (1949). 



Ba-2. Prosser, C. Ladd, W. Pervinsek, Jane Arnold, George Svihla, and P. C. Tomp- 

 kins: -Accumulation and Distribution of Radioactive Strontium, Barium- 

 Lanthanum, Fission Mixture and Sodium in Goldfish, MDDC-49G, Oct. 13, 

 1945. 



Ba-3. Bowen, V. T.: Barium Metabolism in Hornets Studied by Means of Radio- 

 isotopes, Trans. N.Y. Acad. Sci., 2: 68-72 (1949). 



Ba-4. Bowen, V. T.: The Uptake and Distribution of Barium'^" and Lanthanum i^" 

 in Larvae of Drosophila replrta, J. E.rp(l. ZooL, 118: 509-529 (1951). 



Ba-5. Menzel, R. G.: Competitive Uptake by Plants of Potassium, Rubidium, 

 Cesium, and Calcium, Strontium, Barium from Soils, Soil Science, 77: 419-425 

 (1954). 



