. Elementary and dental radiography . the use of the stereoscopic radiographs, is mak-ing a comparative study of the pneumatic sinuses of man and the loweranimals. 264 DENTAL RADIOGRAPHY Dr. Johnson Symington and Dr. J. C. Rankin have recently publisheda book, An Atlas of Skiagrams, illustrating, in twenty radiographs, thedevelopment of the teeth and jaws from birth to the age of sixteen years. I have demonstrated the action of bismuth paste in one case. () No definite conclusions should be drawn from this single case. Thefield of research work along this line is still wide open and in


. Elementary and dental radiography . the use of the stereoscopic radiographs, is mak-ing a comparative study of the pneumatic sinuses of man and the loweranimals. 264 DENTAL RADIOGRAPHY Dr. Johnson Symington and Dr. J. C. Rankin have recently publisheda book, An Atlas of Skiagrams, illustrating, in twenty radiographs, thedevelopment of the teeth and jaws from birth to the age of sixteen years. I have demonstrated the action of bismuth paste in one case. () No definite conclusions should be drawn from this single case. Thefield of research work along this line is still wide open and inviting


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