148 ABSORPTION OF RUBIDIUM AND CESIUM 



kidney, spleen, and lung tissues were then found to contain significant 

 amounts of rubidium or cesium. The concentration of these metals 

 in the muscle amounted, in some cases, as shown by a spectroscopic 

 estimation, to about half the concentration of potassium normally 

 found in mammallian muscle. 



3. The results are regarded as tending to confirm the theory that 

 the peculiarities in the physiological eflects of potassium, including 

 the facility with which it is "selected" by living cells in preference 

 to sodium, are related to the electronic structure of the potassium 

 ion as compared with that of similar ions. The possible relationship 

 of the comparative migration velocity, a function of the electronic 

 structure, to physiological effects is suggested. 



BIBLIOGRAPHY. 



1. Bayliss, W. M., Essentials of general physiology, 1918, 217. 



2. Loeb, J., /. Gen. Physiol, 1920-21, iii, 237. 



3. Jones, H. C, The nature of solution, 1917, 193. 



4. Mines, G. R., Kolloid Z., 1914, xiv, 168. 



5. Landolt, H., Bornstein, R. and Roth, W. A., Physikalisch-chemische 



TabeUen, 4th edition, 1912, Table 249, p. 1124. 



6. Mendel, L. B. and Closson, O. E., Am. J. Physiol., 1906, xvi, 152, 



7. Zwaardemaker, H., J. Physiol., 1919-20, liii, 273. 



8. Loeb, R. F., J. Gen. Physiol., 1920-21, iii, 229. 



