122 BIOLOGICAL EFFECTS OF RADIATION 



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6. CoLWELL, H. A., and C. P. Wakeley. An introduction to the study of x-rays 

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7. CoMPTON, A. H. X-rays and electrons. D. Van Nostrand Company, Inc.; 

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8. DEN Hoed, D. Over de Werking van Harde Roentgenstrahlen en Gamma- 

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9. Holthusen, H. Grundlagen und Praxis der Roentgenstrahlendosierung. 

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12. Perussia, F., and E. Ptjgno-Vanoni. Trattato di Roentgen- e di Curie-Terapia. 

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13. Rutherford, E. Radioactive substances and their radiations. University 

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14. Rutherford, E., J. Chadwick, and CD. Ellis. Radiations from radioactive 

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15. Science of radiology. American Congress of Radiology. Charles C. Thomas; 

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16. Sievert, R. M. Eine Methode zur Messung von Roentgen-Radium- und Ultra- 

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Manuscript received by the editor September, 1934. 



