2 Hanford, W. H., Paften, C. 0., Westbay, C., and Simonton, F. V. A contribution to our knowledge of pyorrhea from the standpoint of histopathology. Dental Cosmos, 1923, v. 65, pp. 12-17.

3 Gottlieb, B. Paradental pyorrhea and alveolar atrophy. Fortschritte der Zahnheilkunde , 1926, p. 371.

4 Simonton, F. V. The etiology of parodontoclasia. Journal of the American Dental Association, 1927, v. 14, pp. 1767-1828.

5 Box, Harold Keith. Studies in periodontal pathology. 1924. Canadian Dental Research Foundation, Bulletin No. 7, pp. 77 and 78.

6 Gottlieb: Paradental pyorrhea and alveolar atrophy. Fortschritte der Zahnheilkunde, 1926, pp. 371-372.

7 The method used by Mr. Batchelder was that of direct smears and percentage counts, together with cultural procedures. Dr. Beckwith's similar findings were made by an entirely different method, i.e., by the use of the dark-field microscope.

10 Hall, Ivan C., and Westbay, Clayton. Bacterial factors in pyorrhea alveolaris. II. Further studies on reaction changes in saliva, due to micro-organisms, and their possible relation to the formation of dental calculus. Dental Cosmos, 1925, v. 67, pp. 115-124.

11 It is shown in fig. 15, "Etiology of Parodontoclasia" (footnote 4), that calculus can form to the depth of the pocket, which, however, is a field of necrotic tissue suitable to calcification.

12 Clark, Guy W., and Levine, Lena. Inorganic constituents of human saliva, II. American Journal of Physiology, 1927, v. 81, pp. 264-275.

13 Simonton, F. V. Progress report of the California Stomatological Research Group. Journal of the American Dental Association, 1926, v. 13, pp. 1586-1592.

14 Naeslund, Carl. Studies of tartar formation. Acta Path. et Microb. Scand., 1926, v. 3, pp. 637-677.

15 Hall, Ivan C. Bacterial factors in pyorrhea alveolaris. III. The isolation of B. tetani, B. welchii and other sporulating anaerobes from human saliva. Journal of Infectious Diseases, 1925, v. 37, pp. 87-92.

16 Hall, Ivan C., and Howitt, Beatrice. Bacterial factors in pyorrhea alveolaris. IV. Micrococcus gazogenes, a minute, gram-negative, non-sporulating anaerobe prevalent in human saliva. Journal of Infectious Diseases, 1925, v. 37, pp. 112-125.

17 Simonton, F. V. A report on some of the findings of the California Stomatological Research Group. Journal of Dental Research, 1927, v. 7, pp. 239-44.

18 Practical application of this work has been made in the preparation and use of antogenous vaccines.

19 A study of the therapeutic value of instillations of bacteriophage is contemplated.

20 Simonton, F. V. Precision device for duplicating roentgenographs. Dental Cosmos, 1928, v. 70, pp. 13-15.

21 Williams, Adrienne. The preparation of combined hard and soft tissues for histological study. Dental Cosmos, 1927, v. 69, pp. 715-721.

22 Clark, Guy W., and Shell, John S. The influence of diet upon the inorganic constituents of human saliva. Dental Cosmos, 1927, v. 69, pp. 500-513.

23 Updegraff, Helen, Greenberg, David M., and Clark, Guy W. A study of the distribution of the diffusible and non-diffusible calcium in the blood sera of normal animals. Journal of Biological Chemistry, 1926, v. 71, pp. 87-117.

24 Clark, Guy W., and Carter, Kenneth L. Factors involved in the reaction changes of human saliva. Journal of Biological Chemistry, 1927, v. 73, pp. 391-404.

25 Jones, Martha R. Studies on inorganic salt metabolism in dogs. III. On certain factors which influence the deposition and resorption of bone. American Journal of Physiology, 1927, v. 79, pp. 694-707.

26 Marshall, John Albert. Dental caries and pulp sequelae resulting from experimental diets. Journal of the American Dental Association, 1927, v. 14, pp. 3-37.

27 Hinshaw, H. Corwin. Cultivation of Trichomonas buccalis, a protozoan of the human mouth. University of California Publications in Zoology, 1927, v. 31, pp. 31-51.

28 Howitt, Beatrice F., Fleming, Willard C., and Simonton, F. V. In press—Dental Cosmos.

29 Howitt, Beatrice F., and Fleming, W. C. In press—Journal of Dental Research.

30 This condition has been described by Dr. H. Corwin Hinshaw in "The Protozoa of the Human Mouth" (thesis written in partial satisfaction of the requirements for the degree of Doctor of Philosophy), awaiting publication. The form of the gingivus is normal, the marginal edge thin and almost colorless. About 1 mm. from this edge a narrow crescent may be seen-red in the case of arterial hyperemia, lavender in venous hyperemia.

31 Crescentric marginal strips, one, two or occasionally more millimeters in width.

32 In the aged it may be noted that pressure (on the back of the hand, for example) produces an imprint which is only slowly obliterated, whereas the young tissues rebound at once.

33 The disappearance of fluids of edema may leave a previously stretched "skin" unsupported, in which case it acquires the surface appearance of parchment, something after the manner of a deflated toy balloon.

34 These are fine radiating wrinkles. They can sometimes be detected only after careful scrutiny or by playing reflected light across them.

35 Marked by loss of tissue at the center, facio-atrially. Precedes the cloven condition where only facial and atrial horns remain, which may be drawn out from the embrasure.36 Simonton, F. V. Examination of the mouth—with special reference to pyorrhea. Journal of the American Dental Association, 1925, v. 12, pp. 287-295.

37 Simonton, F. V. Technic involved in measuring destructive changes of investing tissues of the teeth. Ibid., pp. 448-453.

38 This sometimes is the case on the distal or mesial of cuspids, even in cases where the disease has progressed considerably in other positions.

40 Simonton, F. V. How to clean the teeth and gums. Better Health (San Francisco), October, 1927.

41 Simonton, F. V. A conservative method for the treatment of pyorrhea. Journal of the American Dental Association, 1925, v. 12, pp. 197-202.

42 McCollum, E. V., and Simmonds, Nina. Food, Nutrition and Health. Published by the authors. Baltimore, Md. (Johns Hopkins University).

The Most Significant Findings of the California Stomatological Research Group in the Study of Pyorrhea'

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