1. Helping the A. D. A. Bureau of Chemistry to Help the Public;ibid,1930
2. Studies of the Validity of Advertised Claims for Dental Industrial Products
3. Studies of the Validity of Advertised Claims for Dental Industrial Products
4. pH is the modern chemical symbol used to express the degree of acidity and alkalinity. For instance, water, which is neutral, has a pH value of 7. All values numerically below 7 indicate relative acidity; thus the pH of gastric juice, that is, 0.2 per cent hydrochloric acid, is 1.7. The pH of the normal saliva is approximately 6.8-7 (slightly acid to neutral), while that of blood is 7.4-7.6 (slightly alkaline). pH 0.2 indicates a strongly acid solution.