. The American journal of roentgenology, radium therapy and nuclear medicine . ix. Aun. Surg., November, 1919, 561. 2. I. Levin and M. Levine. Proc. Soc. Exper. Biol. ^ Med., 1917, XV, 24. 3. I. Levin. /. Exper. M., 1911, xiv, 139. 4. L Levin. /. Exper. M., 1912, xvi, 149. 5. M. BoRST. Die Lehre von den Geschwulsten. Weis- haden, 1902, ii, 622. 6. M. B. Schmidt. Verbreitungswege der Karcinoma. Jena, 1903. 7. Orth. Ztschr. f. Krebsforsch. 1904, i, 399- 8. L Levin. Proc. N. York Path. Soc., 1915, xv, 81. 9. L Levin. Ann. Surg., March, 1917, 327. A STEREOSCOPIC TUBE STAND PARTICULARLY ADAPTEDFOR


. The American journal of roentgenology, radium therapy and nuclear medicine . ix. Aun. Surg., November, 1919, 561. 2. I. Levin and M. Levine. Proc. Soc. Exper. Biol. ^ Med., 1917, XV, 24. 3. I. Levin. /. Exper. M., 1911, xiv, 139. 4. L Levin. /. Exper. M., 1912, xvi, 149. 5. M. BoRST. Die Lehre von den Geschwulsten. Weis- haden, 1902, ii, 622. 6. M. B. Schmidt. Verbreitungswege der Karcinoma. Jena, 1903. 7. Orth. Ztschr. f. Krebsforsch. 1904, i, 399- 8. L Levin. Proc. N. York Path. Soc., 1915, xv, 81. 9. L Levin. Ann. Surg., March, 1917, 327. A STEREOSCOPIC TUBE STAND PARTICULARLY ADAPTEDFOR THE EXAMINATION OF THE SKULL By PAUL C. HODGES, of Roentgenology, Union Medical College, PEKING, CHINA. * I HE apparatus here illustrated was de- of both plates, except for a shift of five de- *■ signed with the idea of simplifying grees each way from the center. This shift the examination of the mastoids, sinuses and does not affect the centering of the ray. A jaws—including the lower molar teeth—by practical modification of the well-known \ Or Amc H n. .J^^


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